A return spring (21) made of a metal plate, for biasing a friction pad (6) in a return direction of separating away from a disc (1) is arranged between the friction pad (6) and a mounting member (2). The return spring (21) includes a fixed portion (22), which is on a base end side fixed to an ear portion (7B) of a back plate (7) of the friction pad (6). Then, an abutment portion (25), which is on a distal end side of the return spring (21), is elastically brought into abutment on an abutment plate portion (13D) of a pad spring (13), which is on the mounting member (2) side at a position on an outer side in a disc radial direction relative to the fixed portion (22).