diff --git a/components/ActionSheetComponents/StationDeteilView.js b/components/ActionSheetComponents/StationDeteilView.js
index a933c22..77764cd 100644
--- a/components/ActionSheetComponents/StationDeteilView.js
+++ b/components/ActionSheetComponents/StationDeteilView.js
@@ -10,6 +10,7 @@ import { widthPercentageToDP as wp } from "react-native-responsive-screen";
 import lineColorList from "../../assets/originData/lineColorList";
 import { getPDFViewURL } from "../../lib/getPdfViewURL";
 import { useBusAndTrainData } from "../../stateBox/useBusAndTrainData";
+import { AS } from "../../storageControl";
 
 export const StationDeteilView = (props) => {
   const {
@@ -31,6 +32,11 @@ export const StationDeteilView = (props) => {
     }
     setTrainBus(data[0]);
   }, [currentStation]);
+
+  const [usePDFView, setUsePDFView] = useState(undefined);
+  useEffect(() => {
+    AS.getItem("usePDFView").then(setUsePDFView);
+  }, []);
   const info =
     currentStation &&
     (currentStation[0].StationTimeTable.match(".pdf")
@@ -75,10 +81,12 @@ export const StationDeteilView = (props) => {
                 currentStation={currentStation}
                 originalStationList={originalStationList}
                 oP={() => {
-                  navigate("howto", {
-                    info,
-                    onExit,
-                  });
+                  usePDFView == "true"
+                    ? Linking.openURL(currentStation[0].StationTimeTable)
+                    : navigate("howto", {
+                        info,
+                        onExit,
+                      });
                   StationBoardAcSR.current?.hide();
                 }}
                 oLP={() => Linking.openURL(currentStation[0].StationTimeTable)}
@@ -141,10 +149,12 @@ export const StationDeteilView = (props) => {
                   icon={<FontAwesome name="table" color="white" size={50} />}
                   flex={1}
                   onPressButton={() => {
-                    navigate("howto", {
-                      info,
-                      onExit,
-                    });
+                    usePDFView == "true"
+                      ? Linking.openURL(currentStation[0].StationTimeTable)
+                      : navigate("howto", {
+                          info,
+                          onExit,
+                        });
                     StationBoardAcSR.current?.hide();
                   }}
                   onLongPressButton={() =>
diff --git a/components/settings.js b/components/settings.js
index dcc80c2..a429308 100644
--- a/components/settings.js
+++ b/components/settings.js
@@ -13,12 +13,14 @@ export default function Setting(props) {
   const [iconSetting, setIconSetting] = useState(undefined);
   const [mapSwitch, setMapSwitch] = useState(undefined);
   const [stationMenu, setStationMenu] = useState(undefined);
+  const [usePDFView, setUsePDFView] = useState(undefined);
   const [trainMenu, setTrainMenu] = useState(undefined);
   const [trainPosition, setTrainPosition] = useState(undefined);
   useEffect(() => {
     AS.getItem("iconSwitch").then(setIconSetting);
     AS.getItem("mapSwitch").then(setMapSwitch);
     AS.getItem("stationSwitch").then(setStationMenu);
+    AS.getItem("usePDFView").then(setUsePDFView);
     AS.getItem("trainSwitch").then(setTrainMenu);
     AS.getItem("trainPositionSwitch").then(setTrainPosition);
   }, []);
@@ -96,6 +98,25 @@ export default function Setting(props) {
               onValueChange={(value) => setStationMenu(value.toString())}
             />
           </View>
+          <View style={{ flexDirection: "row", padding: 10 }}>
+            <Text
+              style={{
+                fontSize: 25,
+                alignItems: "center",
+                alignContent: "center",
+                textAlign: "center",
+                textAlignVertical: "center",
+              }}
+            >
+              時刻表PDFをアプリ外で表示
+            </Text>
+            <View style={{ flex: 1 }} />
+            <Switch
+              value={usePDFView == "true" ? true : false}
+              color={usePDFView == "true" ? "red" : null}
+              onValueChange={(value) => setUsePDFView(value.toString())}
+            />
+          </View>
           <View style={{ flexDirection: "row", padding: 10 }}>
             <Text
               style={{
@@ -158,7 +179,7 @@ export default function Setting(props) {
                 textAlignVertical: "center",
               }}
             >
-              releaseChannel: {Updates.releaseChannel}
+              releaseChannel: {Updates.channel}
             </Text>
             <View style={{ flex: 1 }} />
           </View>
@@ -179,6 +200,7 @@ export default function Setting(props) {
             AS.setItem("iconSwitch", iconSetting.toString()),
             AS.setItem("mapSwitch", mapSwitch.toString()),
             AS.setItem("stationSwitch", stationMenu.toString()),
+            AS.setItem("usePDFView", usePDFView.toString()),
             AS.setItem("trainSwitch", trainMenu.toString()),
             AS.setItem("trainPositionSwitch", trainPosition.toString()),
           ]).then(() => {