diff --git a/src/api/endpoints.ts b/src/api/endpoints.ts
index b8388fea4..17cd8ff56 100644
--- a/src/api/endpoints.ts
+++ b/src/api/endpoints.ts
@@ -109,6 +109,9 @@ const endpoints: Endpoint[] = [
 		withCredential: true,
 		secure: true
 	},
+	{
+		name: 'aggregation/users/activity',
+	},
 	{
 		name: 'aggregation/users/post',
 	},
diff --git a/src/api/endpoints/aggregation/users/activity.ts b/src/api/endpoints/aggregation/users/activity.ts
new file mode 100644
index 000000000..6c5efff4b
--- /dev/null
+++ b/src/api/endpoints/aggregation/users/activity.ts
@@ -0,0 +1,112 @@
+/**
+ * Module dependencies
+ */
+import $ from 'cafy';
+import User from '../../../models/user';
+import Post from '../../../models/post';
+
+// TODO: likeやfollowも集計
+
+/**
+ * Aggregate activity of a user
+ *
+ * @param {any} params
+ * @return {Promise<any>}
+ */
+module.exports = (params) => new Promise(async (res, rej) => {
+	// Get 'user_id' parameter
+	const [userId, userIdErr] = $(params.user_id).id().$;
+	if (userIdErr) return rej('invalid user_id param');
+
+	// Lookup user
+	const user = await User.findOne({
+		_id: userId
+	}, {
+		fields: {
+			_id: true
+		}
+	});
+
+	if (user === null) {
+		return rej('user not found');
+	}
+
+	const datas = await Post
+		.aggregate([
+			{ $match: { user_id: user._id } },
+			{ $project: {
+				repost_id: '$repost_id',
+				reply_to_id: '$reply_to_id',
+				created_at: { $add: ['$created_at', 9 * 60 * 60 * 1000] } // Convert into JST
+			}},
+			{ $project: {
+				date: {
+					year: { $year: '$created_at' },
+					month: { $month: '$created_at' },
+					day: { $dayOfMonth: '$created_at' }
+				},
+				type: {
+					$cond: {
+						if: { $ne: ['$repost_id', null] },
+						then: 'repost',
+						else: {
+							$cond: {
+								if: { $ne: ['$reply_to_id', null] },
+								then: 'reply',
+								else: 'post'
+							}
+						}
+					}
+				}}
+			},
+			{ $group: { _id: {
+				date: '$date',
+				type: '$type'
+			}, count: { $sum: 1 } } },
+			{ $group: {
+				_id: '$_id.date',
+				data: { $addToSet: {
+					type: '$_id.type',
+					count: '$count'
+				}}
+			} }
+		]);
+
+	datas.forEach(data => {
+		data.date = data._id;
+		delete data._id;
+
+		data.posts = (data.data.filter(x => x.type == 'post')[0] || { count: 0 }).count;
+		data.reposts = (data.data.filter(x => x.type == 'repost')[0] || { count: 0 }).count;
+		data.replies = (data.data.filter(x => x.type == 'reply')[0] || { count: 0 }).count;
+
+		delete data.data;
+	});
+
+	const graph = [];
+
+	for (let i = 0; i < 365; i++) {
+		let day = new Date(new Date().setDate(new Date().getDate() - i));
+
+		const data = datas.filter(d =>
+			d.date.year == day.getFullYear() && d.date.month == day.getMonth() + 1 && d.date.day == day.getDate()
+		)[0];
+
+		if (data) {
+			graph.push(data);
+		} else {
+			graph.push({
+				date: {
+					year: day.getFullYear(),
+					month: day.getMonth() + 1, // In JavaScript, month is zero-based.
+					day: day.getDate()
+				},
+				posts: 0,
+				reposts: 0,
+				replies: 0
+			});
+		}
+	}
+
+	res(graph);
+});
diff --git a/src/web/app/common/tags/activity-table.tag b/src/web/app/common/tags/activity-table.tag
new file mode 100644
index 000000000..157a7677c
--- /dev/null
+++ b/src/web/app/common/tags/activity-table.tag
@@ -0,0 +1,46 @@
+<mk-activity-table>
+	<svg if={ data } ref="canvas" viewBox="0 0 53 6.85">
+		<rect each={ d, i in data } width="0.8" height="0.8"
+			x={ 52 - (i / 7) } y={ d.date.weekday }
+			fill={ d.color }></rect>
+	</svg>
+	<style>
+		:scope
+			display block
+			max-width 600px
+			margin 0 auto
+			background #fff
+
+			> svg
+				display block
+
+	</style>
+	<script>
+		this.mixin('api');
+
+		this.user = this.opts.user;
+
+		this.on('mount', () => {
+			this.api('aggregation/users/activity', {
+				user_id: this.user.id
+			}).then(data => {
+				data.forEach(d => d.total = d.posts + d.replies + d.reposts);
+				this.peak = Math.max.apply(null, data.map(d => d.total));
+				data.forEach(d => {
+					d.v = d.total / this.peak;
+					d.color = d.v > 0.75
+						? '#196127'
+						: d.v > 0.5
+							? '#239a3b'
+							: d.v > 0.25
+								? '#7bc96f'
+								: d.v > 0
+									? '#c6e48b'
+									: '#eee';
+					d.date.weekday = (new Date(d.date.year + '-' + d.date.month + '-' + d.date.day)).getDay();
+				});
+				this.update({ data });
+			});
+		});
+	</script>
+</mk-activity-table>
diff --git a/src/web/app/common/tags/index.js b/src/web/app/common/tags/index.js
index 58027d4e9..85b34ab36 100644
--- a/src/web/app/common/tags/index.js
+++ b/src/web/app/common/tags/index.js
@@ -25,3 +25,4 @@ require('./messaging/index.tag');
 require('./messaging/form.tag');
 require('./stream-indicator.tag');
 require('./public-timeline.tag');
+require('./activity-table.tag');
diff --git a/src/web/app/mobile/tags/user.tag b/src/web/app/mobile/tags/user.tag
index f8e48bf72..f276658a9 100644
--- a/src/web/app/mobile/tags/user.tag
+++ b/src/web/app/mobile/tags/user.tag
@@ -33,6 +33,7 @@
 						<i>フォロワー</i>
 					</a>
 				</div>
+				<mk-activity-table user={ user }></mk-activity-table>
 			</div>
 			<nav>
 				<a data-is-active={ page == 'posts' } onclick={ go.bind(null, 'posts') }>タイムライン</a>
@@ -146,6 +147,9 @@
 								> i
 									font-size 14px
 
+						> mk-activity-table
+							margin 12px 0 0 0
+
 					> nav
 						display flex
 						justify-content center