A cushion case for a container includes an abutment portion and a supporting portion. The abutment portion is annular and has an inner surface. The supporting portion inclinedly connected with the inner surface of the abutment portion, formed as a ring-shaped and has an inner edge and an inclined surface. The cushion case can be mounted on a bottom edge of a container, which protects the bottom edge of the container or supports the container fixed on a desk to reduce loss when the container falling down by accident.