Compressor

A compressor comprising:

• a casing that forms an outer shell, the casing having a suction port;
• a low-pressure refrigerant gas from a refrigerating cycle received by the casing through the suction port;
• a fixed scroll that is accommodated in the casing and fixed to a casing side;
• an orbiting scroll that is meshed with the fixed scroll and orbits with respect to the fixed scroll;
• a rotation prevention mechanism that prevents rotation of the orbiting scroll;
• and
• a lubricant supply device that supplies a lubricant to the rotation prevention mechanism, wherein
• the rotation prevention mechanism includes a recessed portion formed on either an orbiting scroll side or the casing side, a ring disposed in the recessed portion and having an outer peripheral surface facing an inner peripheral surface of the recessed portion, and a pin provided on either the orbiting scroll side or the casing side and engaged with an inner peripheral surface of the ring,
• a gap is formed between the inner peripheral surface of the recessed portion and the outer peripheral surface of the ring, and
• in a state in which a part of the outer peripheral surface of the ring is in contact with the inner peripheral surface of the recessed portion, a longest portion of the gap has a length of 0.1 mm or more and 0.6 mm or less to reduce a noise generated by a contact between the recessed portion and the ring, and to allow the low pressure refrigerant gas flowing from the refrigerating cycle to be compressed.