diff --git a/src/mfm/parser.ts b/src/mfm/parser.ts
index 322d39493e..9e47baf893 100644
--- a/src/mfm/parser.ts
+++ b/src/mfm/parser.ts
@@ -162,7 +162,7 @@ const mfm = P.createLanguage({
 			let hashtag = match[1];
 			hashtag = hashtag.substr(0, getTrailingPosition(hashtag));
 			if (hashtag.match(/^[0-9]+$/)) return P.makeFailure(i, 'not a hashtag');
-			if (!['\n', ' ', '(', '「', null, undefined].includes(input[i - 1])) return P.makeFailure(i, 'require space before "#"');
+			if (!['\n', ' ', '　', '(', '「', null, undefined].includes(input[i - 1])) return P.makeFailure(i, 'require space before "#"');
 			return P.makeSuccess(i + ('#' + hashtag).length, makeNode('hashtag', { hashtag: hashtag }));
 		}),
 	//#endregion
diff --git a/test/mfm.ts b/test/mfm.ts
index 4e29a69267..c89152f8a2 100644
--- a/test/mfm.ts
+++ b/test/mfm.ts
@@ -186,6 +186,14 @@ describe('Text', () => {
 				], tokens);
 			});
 
+			it('with text (zenkaku)', () => {
+				const tokens = analyze('こんにちは　#世界');
+				assert.deepEqual([
+					text('こんにちは　'),
+					node('hashtag', { hashtag: '世界' })
+				], tokens);
+			});
+
 			it('ignore comma and period', () => {
 				const tokens = analyze('Foo #bar, baz #piyo.');
 				assert.deepEqual([