A hydraulic transaxle (4L, 4R) comprising: a housing which supports an axle and in which oil is stored; a hydraulic continuously variable transmission for driving the axle disposed in the housing that uses the oil as hydraulic oil; an oil-supply mechanism which draws the oil and which includes an external oil-supply circuit that transfers the oil from the housing to the exterior of the housing; a hydraulic speed control mechanism for adjusting output of the hydraulic continuously variable transmission; a parking brake mechanism configured to restrict rotation of the axle, comprising: a brake rotor capable of rotating in association with the axle, and a locking member being displaceable between a first position where the brake rotor is locked and cannot rotate and a second position where the brake rotor is unlocked and is free to rotate; characterized in that the hydraulic transaxle (4L, 4R) further comprises: a hydraulic brake mechanism capable of displacing the locking member to the second position by hydraulic pressure of the oil, wherein the hydraulic speed control mechanism and the hydraulic brake mechanism are connected to the external oil-supply circuit in parallel; and an on-off valve configured to control supply of the oil from the external oil-supply circuit is provided at a location of the external oil-supply circuit closer to the oil-supply mechanism than a connecting point of the hydraulic speed control mechanism and the external oil-supply circuit, and a connecting point of the hydraulic brake mechanism and the external oil-supply circuit. a housing which supports an axle and in which oil is stored; a hydraulic continuously variable transmission for driving the axle disposed in the housing that uses the oil as hydraulic oil; an oil-supply mechanism which draws the oil and which includes an external oil-supply circuit that transfers the oil from the housing to the exterior of the housing; a hydraulic speed control mechanism for adjusting output of the hydraulic continuously variable transmission; a parking brake mechanism configured to restrict rotation of the axle, comprising: a brake rotor capable of rotating in association with the axle, and a locking member being displaceable between a first position where the brake rotor is locked and cannot rotate and a second position where the brake rotor is unlocked and is free to rotate; a brake rotor capable of rotating in association with the axle, and a locking member being displaceable between a first position where the brake rotor is locked and cannot rotate and a second position where the brake rotor is unlocked and is free to rotate; characterized in that the hydraulic transaxle (4L, 4R) further comprises: a hydraulic brake mechanism capable of displacing the locking member to the second position by hydraulic pressure of the oil, wherein the hydraulic speed control mechanism and the hydraulic brake mechanism are connected to the external oil-supply circuit in parallel; and an on-off valve configured to control supply of the oil from the external oil-supply circuit is provided at a location of the external oil-supply circuit closer to the oil-supply mechanism than a connecting point of the hydraulic speed control mechanism and the external oil-supply circuit, and a connecting point of the hydraulic brake mechanism and the external oil-supply circuit. a hydraulic brake mechanism capable of displacing the locking member to the second position by hydraulic pressure of the oil, wherein the hydraulic speed control mechanism and the hydraulic brake mechanism are connected to the external oil-supply circuit in parallel; and an on-off valve configured to control supply of the oil from the external oil-supply circuit is provided at a location of the external oil-supply circuit closer to the oil-supply mechanism than a connecting point of the hydraulic speed control mechanism and the external oil-supply circuit, and a connecting point of the hydraulic brake mechanism and the external oil-supply circuit.