Provided is a compressor, which can be reduced in size and offered at a low price on the market without losing the slidability and workability of the prior art. The compressor (1, 101, 201, 301, 401) is constituted of first composing parts (23, 123, 125, 323, 325, 327, 327A, 327B) and first sliding parts (24, 124, 224, 324, 324A, 326, 326A, 424). The first composing parts can be laser-welded. The first sliding parts are made of cast iron having a carbon content of 2.0 wt. % to 2.7 wt. % and capable of being laser-welded. Thus, the first sliding parts are jointed to the first composing parts by the laser welding operation using no filler material.