The object of the present invention is to propose a compressor in which the rotation of a piston is prevented without introducing a big unbalanced load on the piston.
The compressor comprises a housing (11) having a cylinder bore (12a) therein, a drive shaft (16), a swash plate 18) as a cam plate and a piston including a head (22) and a neck (23). The housing and the piston (20) are made of metal such as aluminium or an aluminium alloy. A rotation preventing member (24) formed separately from the piston is mounted on the neck (23) of the piston. The rotation preventing member is composed of a pair of side arms (24A), an abutting back (24B) and a pair of caulking clips (24C) for mounting on the neck. They are made of metallic material such as iron and formed in one body. The side arm prevents the piston from rotating, cooperating with the contacting surface (24a) formed on the inner wall of the housing.