A compressor comprising: a housing which extends in a vertical direction and in which an oil reservoir formed by accumulation of oil is disposed at a bottom portion, the housing having a tubular housing main body that extends in the vertical direction and has open ends at both ends, an upper lid portion that closes the open end located on an upper end side of the housing main body, and a lower lid portion that closes the open end located on a lower end side of the housing main body; a rotary shaft that is housed in the housing, extends in the vertical direction, and rotates around an axis; a motor having a motor rotor that is provided on an outer peripheral surface of the rotary shaft and rotates together with the rotary shaft, and a motor stator that is provided on an inner peripheral surface of the housing so as to surround the motor rotor from an outer peripheral side; a compression mechanism that is housed in the housing and driven by the motor to compress a refrigerant; and a first oil return path (45,91) that guides the oil, which has moved to an upper portion in the housing, to the bottom portion, wherein the first oil return path (45,91) has an oil return path main body that is internally provided in the housing and extends in the vertical direction, and an oil outlet portion (52,92) that is formed in the housing to allow a lower end of the oil return path main body and the bottom portion in the housing to communicate with each other, characterised in that the housing main body includes a thick wall portion that extends in the vertical direction and is thicker in a radial direction than other portions, and the first oil return path (45,91) is formed in the thick wall portion. a housing which extends in a vertical direction and in which an oil reservoir formed by accumulation of oil is disposed at a bottom portion, the housing having a tubular housing main body that extends in the vertical direction and has open ends at both ends, an upper lid portion that closes the open end located on an upper end side of the housing main body, and a lower lid portion that closes the open end located on a lower end side of the housing main body; a rotary shaft that is housed in the housing, extends in the vertical direction, and rotates around an axis; a motor having a motor rotor that is provided on an outer peripheral surface of the rotary shaft and rotates together with the rotary shaft, and a motor stator that is provided on an inner peripheral surface of the housing so as to surround the motor rotor from an outer peripheral side; a compression mechanism that is housed in the housing and driven by the motor to compress a refrigerant; and a first oil return path (45,91) that guides the oil, which has moved to an upper portion in the housing, to the bottom portion, wherein the first oil return path (45,91) has an oil return path main body that is internally provided in the housing and extends in the vertical direction, and an oil outlet portion (52,92) that is formed in the housing to allow a lower end of the oil return path main body and the bottom portion in the housing to communicate with each other, characterised in that the housing main body includes a thick wall portion that extends in the vertical direction and is thicker in a radial direction than other portions, and the first oil return path (45,91) is formed in the thick wall portion.