diff --git a/components/kaburi.jsx b/components/kaburi.jsx
new file mode 100644
index 0000000..a395238
--- /dev/null
+++ b/components/kaburi.jsx
@@ -0,0 +1,20 @@
+import { Component } from "react";
+
+export default class extends Component {
+  render() {
+    const activity = this.props.activity.filter(a => a.ch === "kaburi");
+    const count = activity.length;
+    const time = activity
+      .map(a => a.endTime - a.startTime)
+      .reduce((a, c) => a + c, 0);
+
+    return (
+      <dl>
+        <dt>かぶり回数</dt>
+        <dd>{count}</dd>
+        <dt>かぶり時間 (ms)</dt>
+        <dd>{time}</dd>
+      </dl>
+    );
+  }
+}
diff --git a/components/vad.jsx b/components/vad.jsx
index 7c6f355..241f7f6 100644
--- a/components/vad.jsx
+++ b/components/vad.jsx
@@ -1,5 +1,6 @@
 import { Component } from "react";
 import * as _VAD from "vad.js/lib/vad.js";
+import Kaburi from "./kaburi";
 
 export default class extends Component {
   state = {
@@ -25,6 +26,21 @@ export default class extends Component {
       1
     );
 
+    const putKaburi = () => {
+      if (this.state.left !== null && this.state.right !== null) {
+        this.setState({
+          activity: [
+            ...this.state.activity,
+            {
+              ch: "kaburi",
+              startTime: Math.max(this.state.left, this.state.right),
+              endTime: new Date().getTime()
+            }
+          ]
+        });
+      }
+    };
+
     const start = stream => {
       this.setState({ audioStream: stream });
       audioContext.createMediaStreamSource(stream).connect(splitter);
@@ -32,6 +48,8 @@ export default class extends Component {
       VAD.bind({})({
         source: leftNode,
         voice_stop: () => {
+          putKaburi();
+
           this.setState({
             left: null,
             activity: [
@@ -52,6 +70,8 @@ export default class extends Component {
       VAD.bind({})({
         source: rightNode,
         voice_stop: () => {
+          putKaburi();
+
           this.setState({
             right: null,
             activity: [
@@ -89,11 +109,7 @@ export default class extends Component {
           <dt>右</dt>
           <dd>{this.state.right && "発話中..."}</dd>
         </dl>
-        <ul>
-          {this.state.activity.map((l, i) => (
-            <li key={i}>{JSON.stringify(l)}</li>
-          ))}
-        </ul>
+        <Kaburi activity={this.state.activity} />
       </div>
     );
   }