The present invention provides a piston-type compressor that effectively reduces the quantity of oil flowing out of the compressor by assuring a full centrifugal separation effect to be induced as a shaft rotates without having to install a complicated oil separation mechanism. In a piston-type compressor in which a working fluid having been taken in through an intake port 30 is first compressed with pistons 17 and is then let out through an outlet port, an axial hole 32a ranging along the axial direction and a radial hole 32b communicating with the axial hole 32a and opening into a crankcase 7 are formed within the shaft 12. In addition, a first intake passage through which the working fluid having flowed in through the intake port 30 is guided via the crankcase 7 to the radial hole 32b and the aacial hole 32a and a second intake passage through which the working fluid having flowed in through the intake port 30 is guided to join the working fluid having been drawn into the first intake passage by bypassing the crankcase 7 are formed in the compressor. The working fluid is taken into cylinders from the area where the first working fluid and the second working fluid join each other.