To simultaneously perform cleaning of skin by soap and massage of the skin by fibers of cocoon containing useful components mainly composed of sericin and fibroin by a series of operations without requiring labor and time.

A soap having a configuration that a soap body or a soap material is filled in a cut cocoon (one end of a cocoon is cut and a silkworm is removed) of the silkworm is provided. By massaging skin with the soap, it becomes possible to simultaneously perform massage of the skin by fibers of the cocoon containing sericin and fibroin components while removing sebum and stains of the skin.