Provided is a low-pressure dome-type scroll compressor with which it is easy to optimally adjust pressing force between scrolls, and in which high-efficiency operation can be achieved under broad operating conditions. This scroll compressor is provided with: a compression mechanism in which a fixed scroll (21) and a movable scroll (22) are combined to form a compression chamber (Sc), and from which refrigerant compressed in the compression chamber is discharged; an electric motor that drives the movable scroll; a casing (10) of which the interior is partitioned into a first space (S1) in whichthe electric motor is disposed and a second space into which refrigerant discharged from the compression mechanism flows; a housing (40) accommodated inside the casing; a floating member (30) that pushes the movable scroll toward the fixed scroll by means of pressure of a back pressure chamber (B) formed between the floating member and the housing; a first seal member (61) that sections the backpressure chamber into a first chamber (B1) and a second chamber (B2); a first flow channel (64) that guides the refrigerant being compressed to the first chamber; and a second flow channel (65) that guides the refrigerant discharged from the compression mechanism to the second chamber.