To provide a storage case for cosmetic breast implement, preventing a cosmetic breast implement made of flexible synthetic resin from getting out of shape, facilitating detachment of the cosmetic breast implement, storing, keeping and maintaining very good preserved state.

This storage case for a cosmetic breast implement is composed of: a storing body A provided with spherical protruded support parts A1, A1 supporting the cosmetic implement 12 shaped like a bowl and made of flexible synthetic resin; and a cover body B freely opened and closed to the storing body A. The protruded support parts A1, A1 are provided with a support means 5 put in non-contact state with the cosmetic implement 12 for large breasts and having air permeability.