diff --git a/src/client/pages/messaging/messaging-room.form.vue b/src/client/pages/messaging/messaging-room.form.vue
index e561cb3db..258300dc5 100644
--- a/src/client/pages/messaging/messaging-room.form.vue
+++ b/src/client/pages/messaging/messaging-room.form.vue
@@ -7,6 +7,7 @@
 		v-model="text"
 		ref="text"
 		@keypress="onKeypress"
+		@compositionupdate="onCompositionUpdate"
 		@paste="onPaste"
 		:placeholder="$ts.inputMessageHere"
 	></textarea>
@@ -29,6 +30,7 @@ import { formatTimeString } from '../../../misc/format-time-string';
 import { selectFile } from '@/scripts/select-file';
 import * as os from '@/os';
 import { Autocomplete } from '@/scripts/autocomplete';
+import { throttle } from 'throttle-debounce';
 
 export default defineComponent({
 	props: {
@@ -46,6 +48,9 @@ export default defineComponent({
 			text: null,
 			file: null,
 			sending: false,
+			typing: throttle(3000, () => {
+				os.stream.send('typingOnMessaging', this.user ? { partner: this.user.id } : { group: this.group.id });
+			}),
 			faPaperPlane, faPhotoVideo, faLaughSquint
 		};
 	},
@@ -147,11 +152,16 @@ export default defineComponent({
 		},
 
 		onKeypress(e) {
+			this.typing();
 			if ((e.which == 10 || e.which == 13) && (e.ctrlKey || e.metaKey) && this.canSend) {
 				this.send();
 			}
 		},
 
+		onCompositionUpdate() {
+			this.typing();
+		},
+
 		chooseFile(e) {
 			selectFile(e.currentTarget || e.target, this.$ts.selectFile, false).then(file => {
 				this.file = file;
diff --git a/src/client/pages/messaging/messaging-room.vue b/src/client/pages/messaging/messaging-room.vue
index 7fdd0a201..3921a081d 100644
--- a/src/client/pages/messaging/messaging-room.vue
+++ b/src/client/pages/messaging/messaging-room.vue
@@ -16,6 +16,14 @@
 			</XList>
 		</div>
 		<footer>
+			<div class="typers" v-if="typers.length > 0">
+				<I18n :src="$ts.typingUsers" text-tag="span" class="users">
+					<template #users>
+						<b v-for="user in typers" :key="user.id" class="user">{{ user.username }}</b>
+					</template>
+				</I18n>
+				<MkEllipsis/>
+			</div>
 			<transition name="fade">
 				<div class="new-message" v-show="showIndicator">
 					<button class="_buttonPrimary" @click="onIndicatorClick"><i><Fa :icon="faArrowCircleDown"/></i>{{ $ts.newMessageExists }}</button>
@@ -86,6 +94,7 @@ const Component = defineComponent({
 			connection: null,
 			showIndicator: false,
 			timer: null,
+			typers: [],
 			ilObserver: new IntersectionObserver(
 				(entries) => entries.some((entry) => entry.isIntersecting)
 					&& !this.fetching
@@ -142,6 +151,9 @@ const Component = defineComponent({
 			this.connection.on('message', this.onMessage);
 			this.connection.on('read', this.onRead);
 			this.connection.on('deleted', this.onDeleted);
+			this.connection.on('typers', typers => {
+				this.typers = typers.filter(u => u.id !== this.$i.id);
+			});
 
 			document.addEventListener('visibilitychange', this.onVisibilitychange);
 
@@ -397,6 +409,7 @@ export default Component;
 
 	> footer {
 		width: 100%;
+		position: relative;
 
 		> .new-message {
 			position: absolute;
@@ -422,6 +435,25 @@ export default Component;
 				}
 			}
 		}
+
+		> .typers {
+			position: absolute;
+			bottom: 100%;
+			padding: 0 8px 0 8px;
+			font-size: 0.9em;
+			color: var(--fgTransparentWeak);
+
+			> .users {
+				> .user + .user:before {
+					content: ", ";
+					font-weight: normal;
+				}
+
+				> .user:last-of-type:after {
+					content: " ";
+				}
+			}
+		}
 	}
 }
 
diff --git a/src/server/api/stream/channels/messaging.ts b/src/server/api/stream/channels/messaging.ts
index 8456871e6..7279da3ec 100644
--- a/src/server/api/stream/channels/messaging.ts
+++ b/src/server/api/stream/channels/messaging.ts
@@ -12,6 +12,9 @@ export default class extends Channel {
 	private otherpartyId: string | null;
 	private otherparty?: User;
 	private groupId: string | null;
+	private subCh: string;
+	private typers: Record<User['id'], Date> = {};
+	private emitTypersIntervalId: ReturnType<typeof setInterval>;
 
 	@autobind
 	public async init(params: any) {
@@ -31,14 +34,28 @@ export default class extends Channel {
 			}
 		}
 
-		const subCh = this.otherpartyId
+		this.emitTypersIntervalId = setInterval(this.emitTypers, 5000);
+
+		this.subCh = this.otherpartyId
 			? `messagingStream:${this.user!.id}-${this.otherpartyId}`
 			: `messagingStream:${this.groupId}`;
 
 		// Subscribe messaging stream
-		this.subscriber.on(subCh, data => {
+		this.subscriber.on(this.subCh, this.onEvent);
+	}
+
+	@autobind
+	private onEvent(data: any) {
+		if (data.type === 'typing') {
+			const id = data.body;
+			const begin = this.typers[id] == null;
+			this.typers[id] = new Date();
+			if (begin) {
+				this.emitTypers();
+			}
+		} else {
 			this.send(data);
-		});
+		}
 	}
 
 	@autobind
@@ -60,4 +77,28 @@ export default class extends Channel {
 				break;
 		}
 	}
+
+	@autobind
+	private async emitTypers() {
+		const now = new Date();
+
+		// Remove not typing users
+		for (const [userId, date] of Object.entries(this.typers)) {
+			if (now.getTime() - date.getTime() > 5000) delete this.typers[userId];
+		}
+
+		const users = await Users.packMany(Object.keys(this.typers), null, { detail: false });
+
+		this.send({
+			type: 'typers',
+			body: users,
+		});
+	}
+
+	@autobind
+	public dispose() {
+		this.subscriber.off(this.subCh, this.onEvent);
+	
+		clearInterval(this.emitTypersIntervalId);
+	}
 }
diff --git a/src/server/api/stream/index.ts b/src/server/api/stream/index.ts
index b04bed0c0..c56a0a157 100644
--- a/src/server/api/stream/index.ts
+++ b/src/server/api/stream/index.ts
@@ -12,7 +12,8 @@ import { Users, Followings, Mutings, UserProfiles, ChannelFollowings } from '../
 import { ApiError } from '../error';
 import { AccessToken } from '../../../models/entities/access-token';
 import { UserProfile } from '../../../models/entities/user-profile';
-import { publishChannelStream } from '../../../services/stream';
+import { publishChannelStream, publishGroupMessagingStream, publishMessagingStream } from '../../../services/stream';
+import { UserGroup } from '../../../models/entities/user-group';
 
 /**
  * Main stream connection
@@ -94,7 +95,12 @@ export default class Connection {
 			case 'disconnect': this.onChannelDisconnectRequested(body); break;
 			case 'channel': this.onChannelMessageRequested(body); break;
 			case 'ch': this.onChannelMessageRequested(body); break; // alias
+
+			// 個々のチャンネルではなくルートレベルでこれらのメッセージを受け取る理由は、
+			// クライアントの事情を考慮したとき、入力フォームはノートチャンネルやメッセージのメインコンポーネントとは別
+			// なこともあるため、それらのコンポーネントがそれぞれ各チャンネルに接続するようにするのは面倒なため。
 			case 'typingOnChannel': this.typingOnChannel(body.channel); break;
+			case 'typingOnMessaging': this.typingOnMessaging(body); break;
 		}
 	}
 
@@ -267,6 +273,17 @@ export default class Connection {
 		}
 	}
 
+	@autobind
+	private typingOnMessaging(param: { partner?: User['id']; group?: UserGroup['id']; }) {
+		if (this.user) {
+			if (param.partner) {
+				publishMessagingStream(param.partner, this.user.id, 'typing', this.user.id);
+			} else if (param.group) {
+				publishGroupMessagingStream(param.group, 'typing', this.user.id);
+			}
+		}
+	}
+
 	@autobind
 	private async updateFollowing() {
 		const followings = await Followings.find({