To enhance the wear resistance and burn resistance of the sliding surfaces of a swash plate and a swash plate support base while improving productivity. Pistons (10) are circumferentially disposed in a cylinder block (9) rotating together with a rotary shaft (5). The tip end (10a) of each piston (10) is guided by the sliding surface (26a) of the swash plate (12) to enable the piston (10) reciprocatingly moving. The projected surface (32) of the swash plate (12) is slidably supported on the recessed surface (22) of the swash plate support base (4) whereby the swash plate can be tilted relative to the rotating axis (L). The recessed surfaces (21, 22) of the swash plate support base (4) have hardened parts (21a, 22a) partially hardened by laser beam.