Provided is a snap button including a male snap button (30) made of metal and a female snap button (10). The male snap button (30) includes a base portion (31) and an engaging protuberance (32) which projects from the base portion (31). The female snap button (10) includes: a ring member (20, 120) made of soft resin, defining an engagement space (20a) which detachably accepts the engaging protuberance (32); and a female snap body (11) made of metal, accommodating the ring member (20, 120). The ring member (20, 120) is provided with a protruding portion (24) which projects further out to one side than an end (12a), on said one side, of the female snap body (11) facing the male snap button (30) in an axial direction, and which is provided in circumferential direction.