選択範囲のセルに8文字のランダム文字列を出力するExcelマクロ

' ランダムな文字列生成
Public Function MakePassword(Optional intLength As Integer = 8, Optional boolIncUpper As Boolean = False, Optional boolIncSign As Boolean = False)

    Dim strPass As String
    Dim strLower As String
    Dim strUpper As String
    Dim strNumber As String
    Dim strSign As String
    Dim strChars As String
    Dim intMax As Integer
    Dim i As Integer
    
    strLower = "qwertyuiopasdfghjklzxcvbnm"
    strUpper = "QWERTYUIOPASDFGHJKLZXCVBNM"
    strNumber = "123456789"
    strSign = "-^@[;:],./!""#$%&'()=~|`{+*}<>?_"

    strChars = strLower & strNumber & strUpper

    If boolIncUpper = True Then
    
        strChars = strChars & strUpper
    
    End If
    
    If boolIncSign = True Then
    
        strChars = strChars & strSign
        
    End If

    intMax = Len(strChars)
    
    For i = 1 To intLength
    
        strPass = Mid(strChars, Int((intMax - 1 + 1) * Rnd + 1), 1) & strPass
    
    Next i

    MakePassword = strPass

End Function

Sub makePassworMain()
    
    Dim selectionCell As Range

    For Each selectionCell In Selection
        selectionCell = MakePassword
    Next

End Sub