diff --git a/src/remote/activitypub/models/person.ts b/src/remote/activitypub/models/person.ts
index 228f1e862e71..492413e1eeaf 100644
--- a/src/remote/activitypub/models/person.ts
+++ b/src/remote/activitypub/models/person.ts
@@ -621,12 +621,25 @@ export async function fetchOutbox(user: IUser) {
 	}
 }
 
-function parseSearchableBy(actor: IActor) {
-	if (actor.searchableBy == null) return null;
+/**
+ * リモートユーザーのsearchable検出
+ */
+function parseSearchableBy(actor: IActor): 'public' | 'none' | null {
+	// indexableで明示的に許可されていればpublic
+	if (actor.indexable === true) return 'public';
+
+	// searchableByでpublicならpublic
 	const searchableBy = toArray(actor.searchableBy);
 	if (searchableBy.includes('https://www.w3.org/ns/activitystreams#Public')) return 'public';
-	if (searchableBy.includes(getApId(actor.followers))) return 'none';
-	return 'none';
+
+	// indexableで明示的に拒否されていればnone
+	if (actor.indexable === false) return 'none';
+
+	// searchableByで明示的に拒否されていればnone (followersは未対応なので拒否扱い)
+	if (actor.searchableBy != null) return 'none';
+
+	// default
+	return null;
 }
 
 export const exportedForTesting = {
diff --git a/src/remote/activitypub/renderer/index.ts b/src/remote/activitypub/renderer/index.ts
index acd5b012d178..49af18cca7c1 100644
--- a/src/remote/activitypub/renderer/index.ts
+++ b/src/remote/activitypub/renderer/index.ts
@@ -25,6 +25,7 @@ export const renderActivity = (x: any): IActivity | null => {
 				Emoji: 'toot:Emoji',
 				featured: 'toot:featured',
 				discoverable: 'toot:discoverable',
+				indexable: 'toot:indexable',
 				// schema
 				schema: 'http://schema.org#',
 				PropertyValue: 'schema:PropertyValue',
diff --git a/src/remote/activitypub/renderer/person.ts b/src/remote/activitypub/renderer/person.ts
index 16d37360c6cd..b3f100d91f95 100644
--- a/src/remote/activitypub/renderer/person.ts
+++ b/src/remote/activitypub/renderer/person.ts
@@ -108,6 +108,7 @@ export default async (user: ILocalUser) => {
 		manuallyApprovesFollowers: user.isLocked || user.carefulRemote,
 		discoverable: !!user.isExplorable,
 		searchableBy: user.searchableBy === 'none' ? [] : ['https://www.w3.org/ns/activitystreams#Public'],
+		indexable: user.searchableBy !== 'none',
 		publicKey: renderKey(user, `#main-key`),
 		isCat: user.isCat,
 		attachment: attachment.length ? attachment : undefined,
diff --git a/src/remote/activitypub/type.ts b/src/remote/activitypub/type.ts
index 2e97ed4448fa..3b201651fd2c 100644
--- a/src/remote/activitypub/type.ts
+++ b/src/remote/activitypub/type.ts
@@ -229,6 +229,7 @@ export interface IActor extends IObject {
 	manuallyApprovesFollowers?: boolean;
 	discoverable?: boolean;
 	searchableBy?: string[] | string;
+	indexable?: boolean;
 	inbox: string;
 	sharedInbox?: string;
 	publicKey?: {
diff --git a/test/activitypub.ts b/test/activitypub.ts
index 8f0e14f3f3ff..897b269fa6c5 100644
--- a/test/activitypub.ts
+++ b/test/activitypub.ts
@@ -310,7 +310,7 @@ describe('ActivityPub', () => {
 	describe('parseSearchableBy', () => {
 		const parseSearchableBy = exportedForTesting.parseSearchableBy;
 
-		it('parseSearchableBy - public', () => {
+		it('parseSearchableBy - indexable: undef, public', () => {
 			assert.strictEqual(parseSearchableBy({
 				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
 				followers: 'https://example.com/users/a/followers',
@@ -318,7 +318,7 @@ describe('ActivityPub', () => {
 			}), 'public');
 		});
 
-		it('parseSearchableBy - follower', () => {
+		it('parseSearchableBy - indexable: undef, followers', () => {
 			assert.strictEqual(parseSearchableBy({
 				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
 				followers: 'https://example.com/users/a/followers',
@@ -326,7 +326,7 @@ describe('ActivityPub', () => {
 			}), 'none');
 		});
 
-		it('parseSearchableBy - reaction', () => {
+		it('parseSearchableBy - indexable: undef, reaction', () => {
 			assert.strictEqual(parseSearchableBy({
 				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
 				followers: 'https://example.com/users/a/followers',
@@ -334,6 +334,76 @@ describe('ActivityPub', () => {
 			}), 'none');
 		});
 
+		it('parseSearchableBy - indexable: true, public', () => {
+			assert.strictEqual(parseSearchableBy({
+				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
+				followers: 'https://example.com/users/a/followers',
+				searchableBy: [ 'https://www.w3.org/ns/activitystreams#Public' ],
+				indexable: true,
+			}), 'public');
+		});
+
+		it('parseSearchableBy - indexable: true, followers', () => {
+			assert.strictEqual(parseSearchableBy({
+				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
+				followers: 'https://example.com/users/a/followers',
+				searchableBy: [ 'https://example.com/users/a/followers' ],
+				indexable: true,
+			}), 'public');
+		});
+
+		it('parseSearchableBy - indexable: true, reaction', () => {
+			assert.strictEqual(parseSearchableBy({
+				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
+				followers: 'https://example.com/users/a/followers',
+				searchableBy: [],
+				indexable: true,
+			}), 'public');
+		});
+
+		it('parseSearchableBy - indexable: false, public', () => {
+			assert.strictEqual(parseSearchableBy({
+				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
+				followers: 'https://example.com/users/a/followers',
+				searchableBy: [ 'https://www.w3.org/ns/activitystreams#Public' ],
+				indexable: false,
+			}), 'public');
+		});
+
+		it('parseSearchableBy - indexable: false, followers', () => {
+			assert.strictEqual(parseSearchableBy({
+				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
+				followers: 'https://example.com/users/a/followers',
+				searchableBy: [ 'https://example.com/users/a/followers' ],
+				indexable: false,
+			}), 'none');
+		});
+
+		it('parseSearchableBy - indexable: false, reaction', () => {
+			assert.strictEqual(parseSearchableBy({
+				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
+				followers: 'https://example.com/users/a/followers',
+				searchableBy: [],
+				indexable: false,
+			}), 'none');
+		});
+
+		it('parseIndexable - true', () => {
+			assert.strictEqual(parseSearchableBy({
+				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
+				followers: 'https://example.com/users/a/followers',
+				indexable: true,
+			}), 'public');
+		});
+
+		it('parseIndexable - false', () => {
+			assert.strictEqual(parseSearchableBy({
+				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',
+				followers: 'https://example.com/users/a/followers',
+				indexable: false,
+			}), 'none');
+		});
+
 		it('parseSearchableBy - undefined', () => {
 			assert.strictEqual(parseSearchableBy({
 				type: 'Person', preferredUsername: 'a', inbox: 'b', outbox: 'c', '@context': 'd',