To correctly control opening/closing of an EGR valve at all times by controlling an opening degree of the EGR valve with a high accuracy having high resolution, and compensating complete closing of the valve, and surely corresponding the closing position of the valve and an operating origin of a motor for driving the valve to each other.

This device is provided with a matching processing unit 67 of an origin which is coped in such a way that a torque balance driving system is adopted to open/close a valve by a balance between a return torque by energizing means and a motor torque by a direct current motor 20, a prescribed looseness is formed in a power transmitting system between the direct current motor 20 and a valve, and an operation position of the direct current motor 20 at a time point when the valve starts to open is found out.