A reciprocating compressor, comprising: a shell in which a discharge pipe is provided; a drive unit arranged inside the shell, the drive unit including a stator (210, 220), a rotor, and a rotary shaft rotated by the rotor; a cylinder block arranged above the rotor, the cylinder block including a cylinder having a compression space for a refrigerant therein; and a rotating plate seat provided at the cylinder block and having a shaft insertion portion into which the rotary shaft is inserted, and at least one insertion hole (331a, 332a) which is formed in the rotating plate seat and to which a damper is coupled; a muffler coupled to the cylinder, the muffler including a suction space through which the refrigerant is suctioned into the compression space and a discharge space through which the refrigerant compressed in the compression space is discharged; and the damper provided at the cylinder block, wherein the damper comprises: a damper base coupled to the cylinder block, the damper base comprising a damper body having a bar shape and being formed of plastic; at least one protrusion (1110, 1120) provided on at least one side of the damper body and supported on an upper surface of the rotating plate seating part, the at least one protrusion (1110, 1120) vertically extending from opposite sides of the damper body; and at least one insertion protrusion (1310, 1330) that extends downward from the at least one protrusion (1110, 1120) and coupled to the at least one insertion hole (331a, 332a); and a rubber damping portion (1210, 1230) provided on the damper base to prevent contact between the damper base and the shell, the rubber damping portion (1210, 1230) being arranged to surround the outer surface of the at least one protrusion (1110, 1120). a shell in which a discharge pipe is provided; a drive unit arranged inside the shell, the drive unit including a stator (210, 220), a rotor, and a rotary shaft rotated by the rotor; a cylinder block arranged above the rotor, the cylinder block including a cylinder having a compression space for a refrigerant therein; and a rotating plate seat provided at the cylinder block and having a shaft insertion portion into which the rotary shaft is inserted, and at least one insertion hole (331a, 332a) which is formed in the rotating plate seat and to which a damper is coupled; a muffler coupled to the cylinder, the muffler including a suction space through which the refrigerant is suctioned into the compression space and a discharge space through which the refrigerant compressed in the compression space is discharged; and the damper provided at the cylinder block, wherein the damper comprises: a damper base coupled to the cylinder block, the damper base comprising a damper body having a bar shape and being formed of plastic; at least one protrusion (1110, 1120) provided on at least one side of the damper body and supported on an upper surface of the rotating plate seating part, the at least one protrusion (1110, 1120) vertically extending from opposite sides of the damper body; and at least one insertion protrusion (1310, 1330) that extends downward from the at least one protrusion (1110, 1120) and coupled to the at least one insertion hole (331a, 332a); and a rubber damping portion (1210, 1230) provided on the damper base to prevent contact between the damper base and the shell, the rubber damping portion (1210, 1230) being arranged to surround the outer surface of the at least one protrusion (1110, 1120). a damper base coupled to the cylinder block, the damper base comprising a damper body having a bar shape and being formed of plastic; at least one protrusion (1110, 1120) provided on at least one side of the damper body and supported on an upper surface of the rotating plate seating part, the at least one protrusion (1110, 1120) vertically extending from opposite sides of the damper body; and at least one insertion protrusion (1310, 1330) that extends downward from the at least one protrusion (1110, 1120) and coupled to the at least one insertion hole (331a, 332a); and a rubber damping portion (1210, 1230) provided on the damper base to prevent contact between the damper base and the shell, the rubber damping portion (1210, 1230) being arranged to surround the outer surface of the at least one protrusion (1110, 1120).