diff --git a/waypoint_manager/scripts/manager_GUI.py b/waypoint_manager/scripts/manager_GUI.py
index de51c17..0642163 100755
--- a/waypoint_manager/scripts/manager_GUI.py
+++ b/waypoint_manager/scripts/manager_GUI.py
@@ -522,9 +522,13 @@
             txt_box = tk.Entry(self.wp_info_win, width=20, font=("Consolas", 15))
             txt_box.insert(tk.END, str(point[key]).lower())
             txt_box.grid(column=1, row=i, padx=2, pady=2, ipady=3, sticky=tk.EW)
+        # New parameter
+        new_param_btn = tk.Button(self.wp_info_win, text="New Parameter", bg="#AFA")
+        new_param_btn["command"] = self.new_param_btn_callback
+        new_param_btn.grid(column=0, columnspan=2, row=self.wp_info_win.grid_size()[1])
         # Apply, DnD(Drag & Drop), remove ボタン
         canv = tk.Canvas(self.wp_info_win)
-        canv.grid(column=0, columnspan=2, row=self.wp_info_win.grid_size()[1], sticky=tk.EW)
+        canv.grid(column=0, columnspan=2, row=self.wp_info_win.grid_size()[1], sticky=tk.EW, pady=5)
         apply_btn = tk.Button(canv, text="Apply", width=5, height=1, bg="#FDD",
                     command=self.apply_btn_callback)
         apply_btn.pack(side=tk.RIGHT, anchor=tk.SE, padx=5, pady=5)
@@ -596,6 +600,40 @@
     
 
     """
+    +++++ New Parameter ボタンを押したときのコールバック +++++
+    """
+    def new_param_btn_callback(self):
+        # Sub window
+        sub_win = tk.Toplevel()
+        sub_win.title("Add new parameter")
+        sub_win.attributes('-topmost', True)
+        font = ("Consolas",15)
+        # Message label
+        label = tk.Label(sub_win, text="Name : Value", font=font, anchor=tk.CENTER, width=20)
+        label.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
+        # Text box
+        name_entry = tk.Entry(sub_win, font=font, width=15)
+        name_entry.grid(column=0, row=1, padx=10, pady=5)
+        colon = tk.Label(sub_win, text=":", font=font, anchor=tk.CENTER, width=2)
+        colon.grid(row=1, column=1)
+        value_entry = tk.Entry(sub_win, font=font, width=15)
+        value_entry.grid(column=2, row=1, padx=10, pady=5)
+        # Buttons
+        add_btn = tk.Button(sub_win, text="Add", width=5, height=1, font=font, anchor=tk.CENTER)
+        add_btn.grid(column=2, row=2, pady=20)
+        cancel_btn = tk.Button(sub_win, text="Cancel", width=7, height=1, font=font, anchor=tk.CENTER)
+        cancel_btn.grid(column=0, row=2, pady=20)
+        # Window position
+        sub_win.update()
+        w = sub_win.winfo_width() + 10
+        h = sub_win.winfo_height()
+        x = int((self.canv_w - w) / 2)
+        y = int((self.canv_h - h) / 2)
+        sub_win.geometry("{}x{}+{}+{}".format(w, h, x, y))
+        return
+
+
+    """
     +++++ ウェイポイント情報を表示するサブウィンドウを閉じたときのコールバック +++++
     """
     def close_wp_info(self):