diff --git a/deno.jsonc b/deno.jsonc
index 7ff94edd..416597c5 100644
--- a/deno.jsonc
+++ b/deno.jsonc
@@ -15,6 +15,8 @@
   "exclude": [
     ".coverage/",
     "tests/denops/testdata/no_check/",
+    "tests/denops/testdata/with_deno_json/",
+    "tests/denops/testdata/with_deno_json2/",
     "tests/denops/testdata/with_import_map/"
   ],
   "imports": {
diff --git a/denops/@denops-private/plugin.ts b/denops/@denops-private/plugin.ts
index 7a828fd1..b539fdb8 100644
--- a/denops/@denops-private/plugin.ts
+++ b/denops/@denops-private/plugin.ts
@@ -1,3 +1,6 @@
+import { isObjectOf } from "@core/unknownutil/is/object-of";
+import { isString } from "@core/unknownutil/is/string";
+import { isUndefined } from "@core/unknownutil/is/undefined";
 import type { Denops, Entrypoint } from "@denops/core";
 import {
   type ImportMap,
@@ -8,8 +11,6 @@ import {
 import { ensure } from "@core/unknownutil";
 import { toFileUrl } from "@std/path/to-file-url";
 import { fromFileUrl } from "@std/path/from-file-url";
-import { join } from "@std/path/join";
-import { dirname } from "@std/path/dirname";
 import { parse as parseJsonc } from "@std/jsonc";
 
 type PluginModule = {
@@ -21,14 +22,18 @@ export class Plugin {
   #loadedWaiter: Promise<void>;
   #unloadedWaiter?: Promise<void>;
   #disposable: AsyncDisposable = voidAsyncDisposable;
+  #scriptUrl: URL;
 
   readonly name: string;
-  readonly script: string;
+
+  get script(): string {
+    return this.#scriptUrl.href;
+  }
 
   constructor(denops: Denops, name: string, script: string) {
     this.#denops = denops;
     this.name = name;
-    this.script = resolveScriptUrl(script);
+    this.#scriptUrl = resolveScriptUrl(script);
     this.#loadedWaiter = this.#load();
   }
 
@@ -39,7 +44,7 @@ export class Plugin {
   async #load(): Promise<void> {
     await emit(this.#denops, `DenopsSystemPluginPre:${this.name}`);
     try {
-      const mod: PluginModule = await importPlugin(this.script);
+      const mod: PluginModule = await importPlugin(this.#scriptUrl);
       this.#disposable = await mod.main(this.#denops) ?? voidAsyncDisposable;
     } catch (e) {
       // Show a warning message when Deno module cache issue is detected
@@ -110,12 +115,16 @@ const voidAsyncDisposable = {
 
 const loadedScripts = new Set<string>();
 
-function createScriptSuffix(script: string): string {
+function refreshScriptFragment(scriptUrl: URL): URL {
   // Import module with fragment so that reload works properly
   // https://github.com/vim-denops/denops.vim/issues/227
-  const suffix = loadedScripts.has(script) ? `#${performance.now()}` : "";
-  loadedScripts.add(script);
-  return suffix;
+  if (loadedScripts.has(scriptUrl.href)) {
+    // Keep the original fragment and add a timestamp
+    const fragment = `${scriptUrl.hash}#${performance.now()}`;
+    return new URL(fragment, scriptUrl);
+  }
+  loadedScripts.add(scriptUrl.href);
+  return scriptUrl;
 }
 
 /** NOTE: `emit()` is never throws or rejects. */
@@ -127,11 +136,11 @@ async function emit(denops: Denops, name: string): Promise<void> {
   }
 }
 
-function resolveScriptUrl(script: string): string {
+function resolveScriptUrl(script: string): URL {
   try {
-    return toFileUrl(script).href;
+    return toFileUrl(script);
   } catch {
-    return new URL(script, import.meta.url).href;
+    return new URL(script);
   }
 }
 
@@ -147,10 +156,23 @@ function isDenoCacheIssueError(e: unknown): boolean {
   return false;
 }
 
+async function loadJson(fileUrl: URL): Promise<unknown> {
+  const content = await Deno.readTextFile(fileUrl);
+  // Always parse as JSONC to be more permissive
+  return parseJsonc(content);
+}
+
+const hasImportMapProperty = isObjectOf({
+  importMap: isString,
+  // If `imports` or `scopes` exists, they will be override `importMap`
+  imports: isUndefined,
+  scopes: isUndefined,
+});
+
 async function tryLoadImportMap(
-  script: string,
+  scriptUrl: URL,
 ): Promise<ImportMap | undefined> {
-  if (script.startsWith("http://") || script.startsWith("https://")) {
+  if (scriptUrl.protocol !== "file:") {
     // We cannot load import maps for remote scripts
     return undefined;
   }
@@ -160,20 +182,13 @@ async function tryLoadImportMap(
     "import_map.json",
     "import_map.jsonc",
   ];
-  // Convert file URL to path for file operations
-  const scriptPath = script.startsWith("file://")
-    ? fromFileUrl(new URL(script))
-    : script;
-  const parentDir = dirname(scriptPath);
   for (const pattern of PATTERNS) {
-    const importMapPath = join(parentDir, pattern);
+    let importMapUrl = new URL(pattern, scriptUrl);
+
+    // Try to load the import map or deno configuration file
+    let jsonValue: unknown;
     try {
-      return await loadImportMap(importMapPath, {
-        loader: (path: string) => {
-          const content = Deno.readTextFileSync(path);
-          return ensure(parseJsonc(content), isImportMap);
-        },
-      });
+      jsonValue = await loadJson(importMapUrl);
     } catch (err: unknown) {
       if (err instanceof Deno.errors.NotFound) {
         // Ignore NotFound errors and try the next pattern
@@ -181,17 +196,32 @@ async function tryLoadImportMap(
       }
       throw err; // Rethrow other errors
     }
+
+    // Resolve import map path in the deno configuration and load it
+    if (
+      /\/deno\.jsonc?$/.test(importMapUrl.pathname) &&
+      hasImportMapProperty(jsonValue)
+    ) {
+      importMapUrl = new URL(jsonValue.importMap, importMapUrl);
+      jsonValue = await loadJson(importMapUrl);
+    }
+
+    // Resolve relative paths in the import map and return it
+    const importMapPath = fromFileUrl(importMapUrl);
+    return await loadImportMap(importMapPath, {
+      loader: () => ensure(jsonValue, isImportMap),
+    });
   }
   return undefined;
 }
 
-async function importPlugin(script: string): Promise<PluginModule> {
-  const suffix = createScriptSuffix(script);
-  const importMap = await tryLoadImportMap(script);
+async function importPlugin(scriptUrl: URL): Promise<PluginModule> {
+  scriptUrl = refreshScriptFragment(scriptUrl);
+  const importMap = await tryLoadImportMap(scriptUrl);
   if (importMap) {
     const importer = new ImportMapImporter(importMap);
-    return await importer.import<PluginModule>(`${script}${suffix}`);
+    return await importer.import<PluginModule>(scriptUrl.href);
   } else {
-    return await import(`${script}${suffix}`);
+    return await import(scriptUrl.href);
   }
 }
diff --git a/denops/@denops-private/plugin_test.ts b/denops/@denops-private/plugin_test.ts
index 3f9dbcb4..ae98cd96 100644
--- a/denops/@denops-private/plugin_test.ts
+++ b/denops/@denops-private/plugin_test.ts
@@ -27,6 +27,12 @@ const scriptInvalidConstraint2 = resolveTestDataURL(
 const scriptWithImportMap = resolveTestDataURL(
   "with_import_map/plugin_with_import_map.ts",
 );
+const scriptWithDenoJson = resolveTestDataURL(
+  "with_deno_json/plugin_with_deno_json.ts",
+);
+const scriptWithDenoJson2 = resolveTestDataURL(
+  "with_deno_json2/plugin_with_deno_json.ts",
+);
 
 Deno.test("Plugin", async (t) => {
   const meta: Meta = {
@@ -563,4 +569,85 @@ Deno.test("Plugin", async (t) => {
       });
     });
   });
+
+  await t.step("importMap property support", async (t) => {
+    await t.step("loads plugin with deno.json", async () => {
+      const denops = createDenops();
+      using _denops_call = stub(denops, "call");
+      using _denops_cmd = stub(denops, "cmd");
+
+      const plugin = new Plugin(denops, "test-plugin", scriptWithDenoJson);
+
+      await plugin.waitLoaded();
+
+      // Should emit events
+      assertSpyCalls(_denops_call, 2);
+      assertSpyCall(_denops_call, 0, {
+        args: [
+          "denops#_internal#event#emit",
+          "DenopsSystemPluginPre:test-plugin",
+        ],
+      });
+      assertSpyCall(_denops_call, 1, {
+        args: [
+          "denops#_internal#event#emit",
+          "DenopsSystemPluginPost:test-plugin",
+        ],
+      });
+
+      // Should call the plugin's main function
+      assertSpyCalls(_denops_cmd, 1);
+      assertSpyCall(_denops_cmd, 0, {
+        args: ["echo 'Deno json plugin initialized'"],
+      });
+    });
+
+    await t.step("plugin can use mapped imports", async () => {
+      const denops = createDenops();
+      using _denops_call = stub(denops, "call");
+      using _denops_cmd = stub(denops, "cmd");
+
+      const plugin = new Plugin(denops, "test-plugin", scriptWithDenoJson);
+      await plugin.waitLoaded();
+
+      // Reset spy calls
+      _denops_cmd.calls.length = 0;
+
+      // Call the dispatcher function
+      const result = await plugin.call("test");
+
+      // Should execute the command with the message from the mapped import
+      assertSpyCalls(_denops_cmd, 1);
+      assertSpyCall(_denops_cmd, 0, {
+        args: ["echo 'Relative import map works for test-plugin!'"],
+      });
+
+      // Should return the greeting from the mapped import
+      assertEquals(result, "Hello from relative import map!");
+    });
+
+    await t.step("importMap is overridden by imports", async () => {
+      const denops = createDenops();
+      using _denops_call = stub(denops, "call");
+      using _denops_cmd = stub(denops, "cmd");
+
+      const plugin = new Plugin(denops, "test-plugin", scriptWithDenoJson2);
+      await plugin.waitLoaded();
+
+      // Reset spy calls
+      _denops_cmd.calls.length = 0;
+
+      // Call the dispatcher function
+      const result = await plugin.call("test");
+
+      // Should execute the command with the message from the mapped import
+      assertSpyCalls(_denops_cmd, 1);
+      assertSpyCall(_denops_cmd, 0, {
+        args: ["echo 'Import map works for test-plugin!'"],
+      });
+
+      // Should return the greeting from the mapped import
+      assertEquals(result, "Hello from mapped import!");
+    });
+  });
 });
diff --git a/tests/denops/testdata/with_deno_json/deno.json b/tests/denops/testdata/with_deno_json/deno.json
new file mode 100644
index 00000000..8445f566
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json/deno.json
@@ -0,0 +1,3 @@
+{
+  "importMap": "./other_path/other_name.json"
+}
diff --git a/tests/denops/testdata/with_deno_json/other_path/helper.ts b/tests/denops/testdata/with_deno_json/other_path/helper.ts
new file mode 100644
index 00000000..5219291a
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json/other_path/helper.ts
@@ -0,0 +1,5 @@
+export const greeting = "Hello from relative import map!";
+
+export function getMessage(name: string): string {
+  return `Relative import map works for ${name}!`;
+}
diff --git a/tests/denops/testdata/with_deno_json/other_path/other_name.json b/tests/denops/testdata/with_deno_json/other_path/other_name.json
new file mode 100644
index 00000000..b51434fa
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json/other_path/other_name.json
@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "@test/helper": "./helper.ts"
+  }
+}
diff --git a/tests/denops/testdata/with_deno_json/plugin_with_deno_json.ts b/tests/denops/testdata/with_deno_json/plugin_with_deno_json.ts
new file mode 100644
index 00000000..a239cad2
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json/plugin_with_deno_json.ts
@@ -0,0 +1,13 @@
+import type { Entrypoint } from "jsr:@denops/core@^7.0.0";
+import { getMessage, greeting } from "@test/helper";
+
+export const main: Entrypoint = async (denops) => {
+  denops.dispatcher = {
+    test: async () => {
+      const message = getMessage("test-plugin");
+      await denops.cmd(`echo '${message}'`);
+      return greeting;
+    },
+  };
+  await denops.cmd("echo 'Deno json plugin initialized'");
+};
diff --git a/tests/denops/testdata/with_deno_json2/deno.jsonc b/tests/denops/testdata/with_deno_json2/deno.jsonc
new file mode 100644
index 00000000..b06e574c
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json2/deno.jsonc
@@ -0,0 +1,8 @@
+{
+  // `importMap` is defined, but ...
+  "importMap": "./other_path/other_name.json",
+  // `imports` is defined, so it will override the `importMap`
+  "imports": {
+    "@test/helper": "./helper.ts"
+  }
+}
diff --git a/tests/denops/testdata/with_deno_json2/helper.ts b/tests/denops/testdata/with_deno_json2/helper.ts
new file mode 100644
index 00000000..8ccde035
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json2/helper.ts
@@ -0,0 +1,5 @@
+export const greeting = "Hello from mapped import!";
+
+export function getMessage(name: string): string {
+  return `Import map works for ${name}!`;
+}
diff --git a/tests/denops/testdata/with_deno_json2/other_path/helper.ts b/tests/denops/testdata/with_deno_json2/other_path/helper.ts
new file mode 100644
index 00000000..5219291a
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json2/other_path/helper.ts
@@ -0,0 +1,5 @@
+export const greeting = "Hello from relative import map!";
+
+export function getMessage(name: string): string {
+  return `Relative import map works for ${name}!`;
+}
diff --git a/tests/denops/testdata/with_deno_json2/other_path/other_name.json b/tests/denops/testdata/with_deno_json2/other_path/other_name.json
new file mode 100644
index 00000000..b51434fa
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json2/other_path/other_name.json
@@ -0,0 +1,5 @@
+{
+  "imports": {
+    "@test/helper": "./helper.ts"
+  }
+}
diff --git a/tests/denops/testdata/with_deno_json2/plugin_with_deno_json.ts b/tests/denops/testdata/with_deno_json2/plugin_with_deno_json.ts
new file mode 100644
index 00000000..a239cad2
--- /dev/null
+++ b/tests/denops/testdata/with_deno_json2/plugin_with_deno_json.ts
@@ -0,0 +1,13 @@
+import type { Entrypoint } from "jsr:@denops/core@^7.0.0";
+import { getMessage, greeting } from "@test/helper";
+
+export const main: Entrypoint = async (denops) => {
+  denops.dispatcher = {
+    test: async () => {
+      const message = getMessage("test-plugin");
+      await denops.cmd(`echo '${message}'`);
+      return greeting;
+    },
+  };
+  await denops.cmd("echo 'Deno json plugin initialized'");
+};