
対象のシート.Range(対象とする行の先頭のセル).End(xlToRight).Column
Sub RetusSuuSample_01()
Dim sheetXXX As Worksheet
Dim RetusSuu As Worksheet
Set sheetXXX = Worksheets("Sheet1")
RetusSuu = sheetXXX.Range("A1").End(xlToRight).Column
End Sub