Supererogation is a concept for a class of acts that go beyond the call of obligation. There is a view called anti-supererogation denying there is such an act that both morally good and not obligatory. I will defend supererogation by showing that arguments on anti-supererogation fall in denying supererogation, and by discussing the distinction between obligation and supererogation. Also, discussion on the properties of supererogation can provide additional defense of supererogation. Furthermore, I will justify a viewpoint which is different from Qualified supererogationism and Unqualified supererogationism.