A compressor capable of reducing oil circulation rate with a simple structure is provided. A compressor 100 in which a piston 136 is caused to reciprocate, so that a refrigerant gas drawn from a suction chamber 141 via a suction hole 103a is compressed and discharged, includes: a partition member 150 dividing the suction chamber 141, into which the refrigerant gas flows from a suction passage 104a, into a first space 141a connected to the suction passage 104a and a second space 141b connected to the suction hole 103a; and a communication passage 150a configured to allow the first space 141a and the second space 141b to be in communication with each other, and introduce the refrigerant gas, from which lubricating oil has been separated, from the first space 141a to the second space 141b.