Provided is a scroll compressor wherein the characteristics of a so-called step-type scroll compressor are exploited to suppress the reduction of a performance or the occurrence of an abnormal noise, which is caused by a torsion moment applied to a rotary scroll. In a so-called step-type scroll compressor (1), when suctioning of gas is stopped in a plurality of pairs of compression chambers (16) which are symmetrical with respect to a point, the volume (V1) of the compression chamber (16) formed on the ventral surface side of a stationary scroll lap (14B) of a stationary scroll (14) is different from the volume (V2) of the compression chamber (16) formed on the ventral surface side of a rotary scroll lap (15B) of a rotary scroll (15).