diff --git a/data/src/main/java/one/nem/lacerta/data/LacertaLibrary.java b/data/src/main/java/one/nem/lacerta/data/LacertaLibrary.java
index cb19b425..6d424179 100644
--- a/data/src/main/java/one/nem/lacerta/data/LacertaLibrary.java
+++ b/data/src/main/java/one/nem/lacerta/data/LacertaLibrary.java
@@ -21,4 +21,7 @@ public interface LacertaLibrary {
     CompletableFuture<LibraryItemPage> getLibraryPage(String pageId, int limit);
     CompletableFuture<LibraryItemPage> getLibraryPage(String pageId, int limit, int offset);
 
+    // Create Folder
+    CompletableFuture<String> createFolder(String path, String name);
+
 }
diff --git a/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java b/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java
index 7fcf9cb5..f2e87da9 100644
--- a/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java
+++ b/data/src/main/java/one/nem/lacerta/data/impl/LacertaLibraryImpl.java
@@ -5,6 +5,7 @@ import java.time.format.DateTimeFormatter;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
+import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 
 import javax.inject.Inject;
@@ -13,6 +14,7 @@ import one.nem.lacerta.data.LacertaLibrary;
 import one.nem.lacerta.model.LibraryItemPage;
 import one.nem.lacerta.model.ListItem;
 import one.nem.lacerta.model.ListItemType;
+import one.nem.lacerta.model.PublicPath;
 import one.nem.lacerta.model.document.DocumentDetail;
 import one.nem.lacerta.source.database.LacertaDatabase;
 import one.nem.lacerta.source.database.common.DateTypeConverter;
@@ -143,4 +145,25 @@ public class LacertaLibraryImpl implements LacertaLibrary {
             return null;
         });
     }
+
+    @Override
+    public CompletableFuture<String> createFolder(String parentId, String name) {
+        return CompletableFuture.supplyAsync(() -> {
+
+            FolderEntity parentFolderEntity = database.folderDao().findById(parentId);
+            PublicPath publicPath;
+            if (parentFolderEntity == null) {
+                publicPath = new PublicPath().resolve("/");
+            } else {
+                publicPath = new PublicPath().resolve(parentFolderEntity.publicPath);
+            }
+
+            FolderEntity folderEntity = new FolderEntity();
+            folderEntity.id = UUID.randomUUID().toString();
+            folderEntity.name = name;
+            folderEntity.publicPath = publicPath.getStringPath();
+            database.folderDao().insert(folderEntity);
+            return folderEntity.id;
+        });
+    }
 }
diff --git a/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryTopFragment.java b/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryTopFragment.java
index 8dd366d8..172246f4 100644
--- a/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryTopFragment.java
+++ b/feature/library/src/main/java/one/nem/lacerta/feature/library/LibraryTopFragment.java
@@ -1,5 +1,6 @@
 package one.nem.lacerta.feature.library;
 
+import android.app.AlertDialog;
 import android.os.Bundle;
 
 import androidx.annotation.NonNull;
@@ -13,6 +14,7 @@ import androidx.recyclerview.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuInflater;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ArrayAdapter;
@@ -23,6 +25,8 @@ import android.widget.Toast;
 import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.appbar.CollapsingToolbarLayout;
 
+import org.w3c.dom.Text;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -34,7 +38,7 @@ import one.nem.lacerta.data.LacertaLibrary;
 import one.nem.lacerta.model.document.DocumentMeta;
 import one.nem.lacerta.model.document.tag.DocumentTag;
 import one.nem.lacerta.utils.LacertaLogger;
-
+import one.nem.lacerta.utils.TextInputDialog;
 
 
 /**
@@ -51,6 +55,10 @@ public class LibraryTopFragment extends Fragment {
     @Inject
     LacertaLogger logger;
 
+    ListItemAdapter listItemAdapter;
+
+    int currentTotalItemCount = 0;
+
     public LibraryTopFragment() {
         // Required empty public constructor
     }
@@ -83,7 +91,7 @@ public class LibraryTopFragment extends Fragment {
 
         RecyclerView recyclerView = view.findViewById(R.id.library_item_recycler_view);
 
-        ListItemAdapter listItemAdapter = new ListItemAdapter(documentId -> {
+        this.listItemAdapter = new ListItemAdapter(documentId -> {
             Toast.makeText(getContext(), documentId, Toast.LENGTH_SHORT).show();
         });
         recyclerView.setAdapter(listItemAdapter);
@@ -92,8 +100,9 @@ public class LibraryTopFragment extends Fragment {
         lacertaLibrary.getLibraryPage(10).thenAccept(libraryItemPage -> {
             logger.debug("LibraryTopFragment", "Item selected! libraryItemPage.getListItems().size(): " + libraryItemPage.getListItems().size());
             listItemAdapter.setLibraryItemPage(libraryItemPage);
+            this.currentTotalItemCount = libraryItemPage.getListItems().size();
             getActivity().runOnUiThread(() -> {
-                listItemAdapter.notifyItemRangeInserted(0, libraryItemPage.getListItems().size() - 1);
+                listItemAdapter.notifyItemRangeInserted(0, this.currentTotalItemCount - 1);
             });
         });
     }
@@ -103,4 +112,45 @@ public class LibraryTopFragment extends Fragment {
         inflater.inflate(R.menu.dir_menu, menu);
         super.onCreateOptionsMenu(menu, inflater);
     }
+
+    // Selected
+    @Override
+    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
+        if (item.getItemId() == R.id.menu_item_create_new_folder) {
+            AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
+            builder.setTitle("フォルダの作成");
+            builder.setMessage("フォルダ名を入力してください");
+            final android.widget.EditText input = new android.widget.EditText(getContext());
+            input.setText("フォルダ名");
+            builder.setView(input);
+            builder.setPositiveButton("作成", (dialog, which) -> {
+                lacertaLibrary.createFolder(null, input.getText().toString()).thenAccept(folderId -> {
+                    logger.debug("LibraryTopFragment", "folderId: " + folderId);
+                });
+                // Refresh
+                updateItem();
+            });
+            builder.setNegativeButton("キャンセル", (dialog, which) -> {
+                dialog.cancel();
+            });
+            builder.show();
+            return true;
+        } else {
+            return super.onOptionsItemSelected(item);
+        }
+    }
+
+    private void updateItem() {
+        lacertaLibrary.getLibraryPage(10).thenAccept(libraryItemPage -> {
+            logger.debug("LibraryTopFragment", "Item selected! libraryItemPage.getListItems().size(): " + libraryItemPage.getListItems().size());
+            getActivity().runOnUiThread(() -> {
+                listItemAdapter.notifyItemRangeRemoved(0, this.currentTotalItemCount - 1);
+            });
+            listItemAdapter.setLibraryItemPage(libraryItemPage);
+            getActivity().runOnUiThread(() -> {
+                listItemAdapter.notifyItemRangeInserted(0, libraryItemPage.getListItems().size() - 1);
+            });
+            this.currentTotalItemCount = libraryItemPage.getListItems().size();
+        });
+    }
 }
diff --git a/model/src/main/java/one/nem/lacerta/model/PublicPath.java b/model/src/main/java/one/nem/lacerta/model/PublicPath.java
index 47f68ca7..de000fbc 100644
--- a/model/src/main/java/one/nem/lacerta/model/PublicPath.java
+++ b/model/src/main/java/one/nem/lacerta/model/PublicPath.java
@@ -27,13 +27,28 @@ public class PublicPath {
     }
 
     private void resolveInternal(String path) {
-        if (path.equals("..")) {
-            this.path.remove(this.path.size() - 1);
+        if (path.startsWith("/")) {
+            this.path.clear();
+            this.path.add("/");
         } else {
-            add(path);
+            if (path.equals("..")) {
+                this.path.remove(this.path.size() - 1);
+            } else if (path.equals(".")) {
+                // do nothing
+            } else {
+                this.path.add(path);
+            }
         }
     }
 
+    public PublicPath parse(String path) {
+        String[] pathArray = path.split("/");
+        for (String p : pathArray) {
+            resolveInternal(p);
+        }
+        return this;
+    }
+
     public PublicPath resolve(String path) {
         resolveInternal(path);
         return this;