Provided on the surface is a recess group in which a plurality of recesses having an opening diameter D of 1 μm or more and 100 μm or less and a depth H of 1 μm or more and 50 μm or less are arranged, and a distance P between adjacent recesses is A mold growth suppressing member that is 0.1 to 10 times the diameter D.表面に、開口部の径Dが1μm以上100μm以下、深さHが1μm以上50μm以下である凹部が複数配置されてなる凹部群を備え、隣接する前記凹部間の距離Pが、前記開口部の径Dの0.1倍以上10倍以下である、カビ繁殖抑制部材。