To solve the problems of being unable to avoid a cost increase and upsizing of a device, and being difficult to cope with a multiple pump as an installation position is restricted, due to the necessity of a large design change and a hydraulic pipe such as a hose, when continuously arranging a preliminary hydraulic pump, since a suction port of a conventional charge pump is arranged so as to open along a center section side surface in a pump case.

This hydraulic continuously variable transmission 1 has a center section 6 for fluidly connecting a hydraulic pump 3 and a hydraulic motor 4 by a closed circuit, and drives a charge pump 19 by a pump shaft 3a of the hydraulic pump 3 by adding a hydraulic fluid replenishing charge pump 19 to the closed circuit to the center section 6. An installation member 2 is detachably installed on a side surface 19g on the opposite side of the center section 6 side by the charge pump 19, and a suction port 41 communicating with a suction part 19d of the charge pump 19 is formed in the installation member 2.