diff --git a/pages/index.js b/pages/index.js
index a35e799..b8afe9c 100644
--- a/pages/index.js
+++ b/pages/index.js
@@ -8,6 +8,7 @@ import Notice from "../components/notice";
 import UploadButton from "../components/uploadButton";
 import TagField from "../components/tagField";
 import TranscriptField from "../components/transcriptField";
+import {Android} from "@material-ui/icons";
 
 const Home = () => {
   // 音声認識インスタンス
@@ -49,10 +50,13 @@ const Home = () => {
     recognizerRef.current.lang = "ja-JP";
     recognizerRef.current.interimResults = true;
     recognizerRef.current.continuous = true;
+    recognizerRef.current.onstart = () => {
+      setDetecting(true);
+    };
     recognizerRef.current.onend = () => {
-      if (detecting) {
+      if (android) {
         recognizerRef.current.start();
-      };
+      }
     };
     recognizerRef.current.onresult = event => {
       [...event.results].slice(event.resultIndex).forEach(result => {
@@ -147,35 +151,19 @@ const Home = () => {
         </Grid>
         <Box m={2}>
           <Grid container alignItems="center" justify="center">
-            <Grid item xs={3}>
+            <Grid item xs={2}>
               <Button
                 variant="outlined"
                 disabled={detecting}
                 color="primary"
                 size="large"
                 onClick={() => {
-                  setDetecting(true);
                   recognizerRef.current.start();
                 }}
               >
                 {detecting ? "検知中..." : "検知開始"}
               </Button>
             </Grid>
-            <Grid item xs={6}/>
-            <Grid item xs={3}>
-              <Button
-                  variant="outlined"
-                  disabled={!detecting}
-                  color="secondary"
-                  size="large"
-                  onClick={() => {
-                    setDetecting(false);
-                    recognizerRef.current.stop();
-                  }}
-              >
-                {detecting ? "検知停止" : "検知待ち"}
-              </Button>
-            </Grid>
           </Grid>
         </Box>
       </Container>