A housing (21) includes a bearing portion (22), a body portion (23) continuous with the bearing portion (22) and extending radially outward, a pressing portion (24) provided radially outside the body portion (23) and pressing a casing (10), and a supporting portion (25) extending toward a fixed scroll (30). An end face of the supporting portion (25) near the fixed scroll (30) is a fastening face (25a) to which the fixed scroll (30) is fastened. A gap (G1) is formed between an inner peripheral surface of the casing (10) and outer peripheral surfaces of the body portion (23) and the supporting portion (25). An axial length (L1) of the gap (G1) is greater than or equal to an axial length (L2) of an inner peripheral surface of the supporting portion (25).