Compressor

A compressor comprising:

• a cylinder including a cylinder chamber with an inner circumferential surface that is a substantially cylindrical surface;
• a shaft including a main shaft and an eccentric part, which is eccentric relative to the main shaft;
• a roller part having an inner circumferential surface fitted on an outer circumferential surface of the eccentric part, the outer circumferential surface being a substantially cylindrical surface, and being placed in the cylinder chamber so as to make an orbital motion;
• a blade part along with the roller part partitioning inside of the cylinder chamber into a low-pressure chamber and a high-pressure chamber;
• and
• bearing parts fixed to the cylinder and respectively including cylindrical surfaces supporting the main shaft,
• a relation (φDs−φDr)/2<ε being satisfied, in which
• φDs is an inside diameter of the inner circumferential surface of the cylinder chamber,
• φDr is an outside diameter of the outer circumferential surface of the roller part, and
• ε is an eccentricity of a central axis of the eccentric part relative to a central axis of the main shaft,
• central axes of the cylindrical surfaces of the bearing parts being eccentric relative to a central axis of the inner circumferential surface of the cylinder chamber, and
• the bearing parts being sliding bearings.