diff --git a/src/BusinessCardManagement.java b/src/BusinessCardManagement.java
index 0ee21eb..433ddf6 100644
--- a/src/BusinessCardManagement.java
+++ b/src/BusinessCardManagement.java
@@ -76,9 +76,15 @@
 	}
 	public void updateFromState2(String scId, String wid, int state, String company_, String representative_, String position_, String establishment_, String address1_, String address2_, String businessdescription1_, String businessdescription2_, String companyoverview_, String URL_, String contactPerson1_, String position1_, String tel1_, String email1_, String contactPerson2_, String position2_, String tel2_, String email2_, String contactPerson3_, String position3_, String tel3_, String email3_, String contactPerson4_, String position4_, String tel4_, String email4_) {
         Map<String, BusinessCardManagementElement> temp_if14;
-        if ((((state==0)&&!company_.equals(""))&&!(this.value.containsKey(company_)))) {
-            this.value.put(company_,new BusinessCardManagementElement(representative_, position_, establishment_, address1_, address2_, businessdescription1_, businessdescription2_, companyoverview_, URL_, contactPerson1_, position1_, tel1_, email1_, contactPerson2_, position2_, tel2_, email2_, contactPerson3_, position3_, tel3_, email3_, contactPerson4_, position4_, tel4_, email4_));
-            temp_if14 = this.value;
+        if ((state==0)&&!company_.isEmpty()) {
+			if (!(this.value.containsKey(company_))) {
+				this.value.put(company_, new BusinessCardManagementElement(representative_, position_, establishment_, address1_, address2_, businessdescription1_, businessdescription2_, companyoverview_, URL_, contactPerson1_, position1_, tel1_, email1_, contactPerson2_, position2_, tel2_, email2_, contactPerson3_, position3_, tel3_, email3_, contactPerson4_, position4_, tel4_, email4_));
+				temp_if14 = this.value;
+			} else {
+				JPanel mainPanel = screen.getPresenter().getMainPanel();
+				JOptionPane.showMessageDialog(mainPanel, "会社名は既に存在します。");
+				temp_if14 = this.value;
+			}
         } else {
             temp_if14 = this.value;
         }
diff --git a/src/CurScreen.java b/src/CurScreen.java
index 71a9f16..30f08a4 100644
--- a/src/CurScreen.java
+++ b/src/CurScreen.java
@@ -79,7 +79,7 @@
 			if ((!company.equals("")&&!(businessCardManagement.containsKey(company)))) {
 				temp_if8 = "企業一覧";
 			} else {
-				temp_if8 = "企業一覧";
+				temp_if8 = this.value;
 			}
 			temp_if9 = temp_if8;
 		} else {