To make a tilting rotary member smoothly tiltable without requiring a degree of high machining accuracy by constituting a linkage transmitting the rotation of a rotary member to this tilting rotary member by way of installing at least a pair of slide pins connecting a pin supported by the rotary member and this tilting rotary member.

When power of a mounted engine is transmitted to a shaft 5, the torque is transmitted to a swash plate 10 by way of a thrust flange 40 and linkage 41, and this swash plate 10 is thereby rotated. Since a shoe 11 relatively rotates on the swash plate 10 by the rotation of this swash plate 10, a piston 7 is made to do its rectilinear reciprocation, whereby those of suction, compression and discharge of coolant gas are carried out. At the time, the linkage 41 is composed of installing at least a pair of slide pins 43 connecting a pin 45 supported on the thrust flange 40 and the swash plate 10, and in this constitution, since each end of the slide pins 43 is supported on the pin 45 rotatably and free of slide motion in the axial direction, any possible galling in these slide pins 43 is eliminated, and thus smooth operations are ensured.