To prevent the occurrence of defective operation due to adhesion of a foreign matter, such as mad and refuse, to the constituting members of the mechanisms of this device and the occurrence of disorder to regulation due to an impact from an external part in a conventional hydraulic continuously variable transmission.

A neutral position holding mechanism 11, a rotation limiting mechanism, and an over stroke mechanism are integrally built in a hydraulic continuously variable transmission 10, and the drive pin 41 of the spool 72 of a hydraulic servo mechanism 61 is integrally operated through rotation operation of a control lever 20. A guide hole 93a to guide the drive pin is formed in a casing 93 at which the control lever is supported, the drive pin is moved along the guide hole, and the drive pin is moved in parallel to a spool.