diff --git a/utils/src/main/java/one/nem/lacerta/utils/impl/DeviceInfoUtilsImpl.java b/utils/src/main/java/one/nem/lacerta/utils/impl/DeviceInfoUtilsImpl.java
index 703bc959..1cb5c759 100644
--- a/utils/src/main/java/one/nem/lacerta/utils/impl/DeviceInfoUtilsImpl.java
+++ b/utils/src/main/java/one/nem/lacerta/utils/impl/DeviceInfoUtilsImpl.java
@@ -24,12 +24,22 @@ public class DeviceInfoUtilsImpl implements DeviceInfoUtils {
         return Objects.requireNonNull(applicationContext.getExternalFilesDir(null)).toPath();
     }
 
+    @Override
+    public String getExternalStorageDirectoryString() {
+        return getExternalStorageDirectory().toString();
+    }
+
     @Override
     public Path getExternalStorageDirectory(String type) {
         // TODO-rca: 結果がnullだった場合の処理を追加する？
         return Objects.requireNonNull(applicationContext.getExternalFilesDir(type)).toPath();
     }
 
+    @Override
+    public String getExternalStorageDirectoryString(String type) {
+        return getExternalStorageDirectory(type).toString();
+    }
+
     @Override
     public boolean hasPermission(String permission) {
         return false;