In a scroll compressor of the present invention, a fixed scroll 11 and an orbiting scroll 12 are meshed with each other such that spiral laps of the fixed scroll 11 and the orbiting scroll 12 inwardly face each other, an Oldham ring 26 is provided between the main bearing member 19 and the orbiting scroll 12, and a key portion of the Oldham ring 26 is inserted into a key groove 19a of the main bearing member 19. Grooves 19b are formed in Oldham ring 26 sliding surfaces on both sides of the key groove 19a. According to this configuration, the Oldham ring 26 and the main bearing member 19 can be restrained from coming into contact with each other in the vicinity of the bearing key groove 19a, and restrained from vibrating, and it is possible to provide an inexpensive scroll compressor of low noise.