A compressor used in a refrigerating cycle, wherein the bottom face side of a connected portion between the bottom surface and the inner peripheral surface of a housing is formed in an R-shape and the inner peripheral surface side thereof is formed in a tilted shape or an R-shape, and a tough material having a tensile strength of 800 N/mm or higher at the room temperature is used for at least one of those parts forming the housing and an internal mechanism, whereby the wall thickness of component parts can be designed thin while assuring the strengths thereof by properly selecting the materials used for the component parts and improving the shape of the housing so that the overall size, weight, and cost of the compressor can be reduced.