diff --git a/component/viewer/src/main/java/one/nem/lacerta/component/viewer/ViewerContainerFragment.java b/component/viewer/src/main/java/one/nem/lacerta/component/viewer/ViewerContainerFragment.java
index 8f91f666..e4a5dc30 100644
--- a/component/viewer/src/main/java/one/nem/lacerta/component/viewer/ViewerContainerFragment.java
+++ b/component/viewer/src/main/java/one/nem/lacerta/component/viewer/ViewerContainerFragment.java
@@ -211,7 +211,12 @@ public class ViewerContainerFragment extends Fragment {
                 .setListener(new LacertaApplyTagDialog.LacertaApplyTagDialogListener() {
                     @Override
                     public void onDialogPositiveClick(ArrayList<DocumentTag> appliedTags) {
-                        // 適用
+                        lacertaLibrary.applyTagListToDocument(documentId, appliedTags).thenAccept(aVoid -> {
+                            getActivity().runOnUiThread(() -> {
+                                Toast.makeText(getContext(), "タグを適用しました", Toast.LENGTH_SHORT).show();
+                                lacertaApplyTagDialog.dismiss();
+                            });
+                        });
                     }
 
                     @Override