To reduce costs on a three-position hydraulic direction changing device.

In a hydraulic circuit 11 for a three-position hydraulic direction changing device that is remotely controllable, and provided with a first hydraulic direction changing valve 30 to operate a cylinder device 6 for a load-carrying platform of a car carrying truck, a second hydraulic direction changing valve 40 to operate a hydraulic motor 7 for a winch, and a third hydraulic direction changing valve 50 to operate a cylinder device 8 for ascending a slope, solenoid valves 37, 47, and 57 to change to first change positions 30b, 40b, and 50b are connected to first ports 35, 45, and 55 of double action cylinder device 31, 41, and 51 of the respective changing valves. To second ports 36, 46, and 56 of the respective double action cylinder devices, a common solenoid valve 28 to change to second change positions 30c, 40c, and 50c is connected commonly for the changing valves. By thus commonly using the solenoid valve to change to the second change positions, the total number of the solenoid valves can be reduced, while reciprocating action of each actuator can be secured, thereby cost can be reduced.