To improve the accuracy of control flow proportional to the press force to a valve body in a proportional control valve.

The valve body which has a hemisphere section at its end is made of fluororesin in the proportional control valve in which the amount of fluid flowing through a through-hole is changed by controlling the press force of the valve body pressed by a valve seat with the through-hole. And this valve body is fixed to a magnetic plunger of which the press force is changed by electromagnetic force change. Vanishing processing is given to the surface of the valve seat by the same shaped member with the same size as the hemisphere section of the valve body.