diff --git a/src/main/java/info/istlab/IoTP/SerialChecker.java b/src/main/java/info/istlab/IoTP/SerialChecker.java
index 64c6b34..95bec76 100644
--- a/src/main/java/info/istlab/IoTP/SerialChecker.java
+++ b/src/main/java/info/istlab/IoTP/SerialChecker.java
@@ -1,5 +1,8 @@
 package info.istlab.IoTP;
 
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
 import java.util.ArrayList;
 import java.util.Hashtable;
 
@@ -12,6 +15,8 @@
     String last_connections;
 
     ArrayList<String> validSerialNames;
+    Hashtable<String,String> invalidSerialNames; // WindowsではBluetoothシリアルが表示されてしまうので、起動時のみ arduino-cli board list
+                                          // の結果をつかって判定する。
     Hashtable<String, SerialPort> portHash;
 
     public SerialChecker(Launcher _launcher) {
@@ -19,12 +24,39 @@
         last_connections = "";
 
         validSerialNames = new ArrayList<String>();
+        invalidSerialNames = new Hashtable<String,String>();
+        getBoardListForInvalid();
         portHash = new Hashtable<String, SerialPort>();
         thread = new Thread(this);
         thread.start();
 
     }
 
+    private void getBoardListForInvalid() {
+        ProcessBuilder processBuilder = new ProcessBuilder("arduino-cli", "board", "list");
+        Process process;
+        ArrayList<String> out = new ArrayList<String>();
+        try {
+            process = processBuilder.start();
+
+            BufferedReader reader = new BufferedReader(new InputStreamReader(process.getInputStream()));
+            String line;
+            while ((line = reader.readLine()) != null) {
+                if (line.indexOf("(USB)") == -1)
+                    out.add(line);
+            }
+            process.waitFor();
+        } catch (IOException | InterruptedException e1) {
+            e1.printStackTrace();
+        }
+        for (String s : out) {
+            String[] a = s.split(" ");
+            if (a[0].indexOf("シリアル") == -1){
+                invalidSerialNames.put(a[0], a[0]); // (USB)ではないものをすべて登録 valはべつにa[0]じゃなくてもよい。
+            }
+        }
+    }
+
     @Override
     public void run() {
         while (thread != null) {
@@ -48,39 +80,44 @@
             launcher.updateTitle(currentString);
             launcher.updateSerialMenu(validSerialNames);
 
-            if (last_connections.length() > currentString.length()){
-                //どれが減ったか調べて、なくなったものを切断する
+            if (last_connections.length() > currentString.length()) {
+                // どれが減ったか調べて、なくなったものを切断する
                 String sep[] = last_connections.split(" ");
-                Hashtable<String,String> currentHash = new Hashtable<String,String>();
-                for(String t: validSerialNames) currentHash.put(t,t);
-                for(String s: sep){ //過去の接続リスト
-                    if (currentHash.get(s) == null){
+                Hashtable<String, String> currentHash = new Hashtable<String, String>();
+                for (String t : validSerialNames)
+                    currentHash.put(t, t);
+                for (String s : sep) { // 過去の接続リスト
+                    if (currentHash.get(s) == null) {
                         SerialWindow deadWin = SerialWindow.hash.get(s);
-                        if (deadWin != null) deadWin.disposeWin();
+                        if (deadWin != null)
+                            deadWin.disposeWin();
                     }
                 }
                 // SerialWindow.closeAll("切断されました");
             } else {
                 String key = currentString;
-                if (SerialWindow.hash.get(key)!= null){
+                if (SerialWindow.hash.get(key) != null) {
                     SerialWindow.hash.get(key).reconnect();
                 }
             }
         }
         last_connections = currentString;
     }
-    String getCurrentSerialNames(){
+
+    String getCurrentSerialNames() {
         SerialPort[] ports = SerialPort.getCommPorts();
         StringBuffer sb = new StringBuffer();
         for (SerialPort sp : ports) {
             String name = sp.getSystemPortName();
             if (name.startsWith("cu.usbserial") || name.startsWith("COM")) {
-                sb.append(name+" ");
+                if (invalidSerialNames.containsKey(name)) continue;
+                sb.append(name + " ");
             }
         }
         return sb.toString().trim();
     }
-    void updateSerialNames(){
+
+    void updateSerialNames() {
         validSerialNames.clear();
         portHash.clear();
         SerialPort[] ports = SerialPort.getCommPorts();