Scroll compressor

A scroll compressor comprising:

• a compression mechanism including a movable scroll and a fixed scroll and a compression chamber defined between the movable scroll and the fixed scroll,
• the compression mechanism having a back-pressure chamber defined on a back face of an end plate of the movable scroll,
• the compression mechanism having an annular space defined at an outer periphery of the end plate of the movable scroll,
• the movable scroll having a movable-side passage through which the compression chamber intermittently communicates with the back-pressure chamber in accordance with eccentric rotation of the movable scroll,
• the end plate of the movable scroll having a communication space through which the movable-side passage communicates with the annular space, the communication space including
• a first communication portion located forward of the movable-side passage in a direction of eccentric rotation, and
• a second communication portion located rearward of the movable-side passage in the direction of eccentric rotation, and
• a first circumferential width of a first opening in the first communication portion being larger than a second circumferential width of a second opening in the second communication portion, the first opening being open toward to the annular space, and the second opening being open toward the annular space.