Ground wires (Wpg, Wsg) are shared between a drive-side pulley solenoid valve (SLP) and a driven-side pulley solenoid valve (SLS). Therefore, when a disconnection or short circuit occurs in the shared portion, a drive-side pulley (44) and a driven-side pulley (48) show substantially the same behavior. As a result, changes in the speed ratio [gamma]cvt of a continuously variable transmission (26) are suppressed and changes in vehicle behavior are also suppressed. Therefore, it is possible to suppress the degradation of drivability during the failure of the solenoid valves (SLP, SLS) involved in power transmission.