To provide the subject compressor with high reliability and high efficiency by supplying lubricating oil stored in a lower part in a sealed vessel to a sliding surface between a piston and a cylinder.

A cylinder part 10 is elastically supported by a sealed vessel, so that the cylinder part 10 vibrates by reciprocating motion of a piston part 20. A lubricating oil supply device 1 fixed to the cylinder part 10 also vibrates according to vibration. A piston 1B supported in a cylinder case 1A by a spring reciprocates in the horizontal direction in the cylinder case 1A. Lubricating oil of a suction space 1C moves to a discharge space 1D by passing through a passage 11 when the piston 1B moves to the suction space 1C side. When the piston 1B moves to the discharge space 1D side, a valve element closes the passage 11, so that the lubricating oil in the discharge space 1D is introduced into an oil passage 6 from a discharge port 1H. The lubricating oil separates into one advancing to the oil passage 7 side and one advancing to the oil groove 2 side.