回答編集履歴
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test
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@@ -1,3 +1,51 @@
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For文の中で隣のセルの値を変える都度、このChangeイベントが走っているのではないでしょうか。
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なので、この処理の先頭で Application.EnableEvents = False にするのが良いと思います。
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```VBA
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Private Sub Worksheet_Change(ByVal Target As Range)
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'Eventの感知を停止
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Application.EnableEvents = False
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'処理時間測定用
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Dim startTime As Double, endTime As Double
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startTime = Timer
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Dim myRng As Range
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For Each myRng In Target
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'値が入力されるセルは１列目＝A列のみと仮定。
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If myRng.Column = 1 Then myRng.Offset(, 1).Value = IIf(myRng.Value = "", "", "○")
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Next myRng
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'処理時間測定用
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endTime = Timer
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Debug.Print endTime - startTime
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'Eventの感知を再開
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Application.EnableEvents = True
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End Sub
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```
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