diff --git a/vba_code_common.bas b/vba_code_common.bas
index 88f18f8..4618650 100644
--- a/vba_code_common.bas
+++ b/vba_code_common.bas
@@ -76,27 +76,6 @@ Function SelectCSVFile() As String
     End With
 End Function
 
-Function ReadCSVFile(ByVal filePath As String) As Variant
-    If filePath = "" Then
-        ReadCSVFile = Array()
-        Exit Function
-    End If
-    
-    Dim stream As Object
-    Dim textContent As String
-    
-    Set stream = CreateObject("ADODB.Stream")
-    With stream
-        .Type = 2
-        .Charset = "shift_jis"
-        .Open
-        .LoadFromFile filePath
-        textContent = .ReadText
-        .Close
-    End With
-    
-    ReadCSVFile = Split(textContent, vbLf)
-End Function
 
 Function GetSaveCSVPath(Optional ByVal defaultName As String = "") As String
     Dim savePath As String
@@ -130,27 +109,6 @@ Sub WriteCSVFile(ByVal filePath As String, ByVal content As String)
     End With
 End Sub
 
-Function ReadCSVFileWithUtf8(ByVal filePath As String) As Variant
-    If filePath = "" Then
-        ReadCSVFileWithUtf8 = Array()
-        Exit Function
-    End If
-    
-    Dim stream As Object
-    Dim textContent As String
-    
-    Set stream = CreateObject("ADODB.Stream")
-    With stream
-        .Type = 2
-        .Charset = "utf-8"
-        .Open
-        .LoadFromFile filePath
-        textContent = .ReadText
-        .Close
-    End With
-    
-    ReadCSVFileWithUtf8 = Split(textContent, vbLf)
-End Function
 
 Function ReadCSVFile(ByVal filePath As String, Optional ByVal charset As String = "shift_jis") As Variant
     If filePath = "" Then