diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index 70955a2a73..423b3be916 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -28,7 +28,8 @@ declare namespace acct {
         parseUrl,
         parseAcctOrUrl,
         toString_2 as toString,
-        Acct
+        Acct,
+        UrlIsNotAcctLikeError
     }
 }
 export { acct }
@@ -3640,6 +3641,11 @@ type TestResponse = operations['test']['responses']['200']['content']['applicati
 // @public (undocumented)
 function toString_2(acct: Acct): string;
 
+// @public (undocumented)
+class UrlIsNotAcctLikeError extends Error {
+    constructor();
+}
+
 // @public (undocumented)
 type User = components['schemas']['User'];
 
diff --git a/packages/misskey-js/src/acct.ts b/packages/misskey-js/src/acct.ts
index e30599b650..e8c4524ec4 100644
--- a/packages/misskey-js/src/acct.ts
+++ b/packages/misskey-js/src/acct.ts
@@ -27,15 +27,25 @@ export function parse(acct: string): Acct {
 	return { username: split[0], host: split[1] || null };
 }
 
+export class UrlIsNotAcctLikeError extends Error {
+	constructor() {
+		super('This url is not acct like.');
+	}
+}
+
 export function parseUrl(str: string): Acct {
 	const url = new URL(str);
+
+	if (url.hash.length > 0) throw new UrlIsNotAcctLikeError();
+	if (url.search.length > 0) throw new UrlIsNotAcctLikeError();
+
 	const splited = url.pathname.split('/');
 	let path = splited.pop();
 	if (path === '') path = splited.pop(); // If the last segment is empty due to a trailing '/', use the previous segment
 
-	if (!path) throw new Error('This url is not acct like.');
-	if (!path.startsWith('@')) throw new Error('This url is not acct like.');
-	if (path.length <= 1) throw new Error('This url is not acct like.');
+	if (!path) throw new UrlIsNotAcctLikeError();
+	if (!path.startsWith('@')) throw new UrlIsNotAcctLikeError();
+	if (path.length <= 1) throw new UrlIsNotAcctLikeError();
 
 	const split = path.split('@', 3); // ['', 'username', 'other.example.com']
 
diff --git a/packages/misskey-js/test/acct.ts b/packages/misskey-js/test/acct.ts
index 510b106ad2..4200e593de 100644
--- a/packages/misskey-js/test/acct.ts
+++ b/packages/misskey-js/test/acct.ts
@@ -59,6 +59,14 @@ function testParseUrl(fn: (acct: string) => acct.Acct) {
 	it('throws url have @username path but ended with sub directory', () => {
 		expect(() => fn('https://example.com/@alice/subdir')).toThrowError();
 	});
+
+	it('throws url with search params', () => {
+		expect(() => fn('https://example.com/@alice?foo=bar')).toThrowError();
+	});
+
+	it('throws url with hash', () => {
+		expect(() => fn('https://example.com/@alice#fragment')).toThrowError();
+	});
 }
 
 describe('acct.parse', () => {