A scroll compressor pertaining to the invention has high reliability by inhibiting seizure of sliding surfaces of an Oldham coupling and a movable scroll. The scroll compressor (101) is equipped with the movable scroll (26) that has first key grooves (26d), a housing (23) that has second key grooves (23d), and the Oldham coupling (39) between the movable scroll (26) and the housing (23). The Oldham coupling (39) has an annular body portion (39a), two pairs of first key portions (39b) that are fitted into the first key grooves (26d), and second key portions (39c) that are fitted into the second key grooves (23d). Key gaps (70) are formed between outer peripheral surfaces of the first key portions (39b) and inner peripheral surfaces of the first key grooves (26d). The key gaps (70) have first gaps (71) on the radial direction inner side of the Oldham coupling (39) and second gaps (72) on the radial direction outer side. The second gaps (72) are wider than the first gaps (71), so they can hold a larger quantity of lubricating oil than the first gaps (71).