POWER TRANSMISSION DEVICE FOR VEHICLE

A transmission () as a power transmission device for a vehicle comprises an input shaft (), an output shaft (), and a planetary continuously variable transmission mechanism (). The planetary continuously variable transmission mechanism () comprises a planetary gear mechanism (), a pump side clutch (), a hydraulic pump (), a hydraulic motor (), and a motor side clutch (). The hydraulic pump () and the hydraulic motor () are connected via a pair of main lines (A, B). When the transmission () is switched from a traveling state to a neutral state, at least one clutch (, ) of the pump side clutch () and the motor side clutch () is released.