A variable-capacity compressor control valve (1,2) comprising: a valve body including a valve chamber with a valve orifice, a Ps inlet/outlet port communicating with a suction chamber of a compressor, a Pd introduction port arranged upstream of the valve orifice and communicating with a discharge chamber of the compressor, and a Pc inlet/outlet port arranged downstream of the valve orifice and communicating with a crank chamber of the compressor; a main valve element adapted to open or close the valve orifice; an electromagnetic actuator including a plunger and an attractor, the electromagnetic actuator being adapted to move the main valve element in a direction to open or close the valve orifice; a pressure-sensitive chamber adapted to receive a suction pressure Ps from the compressor via the Ps inlet/outlet port; and a pressure-sensitive reaction member adapted to urge the main valve element in the direction to open or close the valve orifice in accordance with a pressure in the pressure-sensitive chamber; wherein the main valve element includes an in-valve release passage for releasing a pressure Pc in the crank chamber to the suction chamber of the compressor via the Ps inlet/outlet port, and a sub valve element adapted to open or close the in-valve release passage is provided; characterized in that the plunger has a cylindrical shape, and the sub valve element is inserted in the plunger, and one or more magnetic bodies made of the same magnetic material as or a different magnetic material from that of the plunger are fixed to at least a part of an inner periphery of an end portion of the plunger that is opposite the attractor in order to increase an attraction force of the electromagnetic actuator. a valve body including a valve chamber with a valve orifice, a Ps inlet/outlet port communicating with a suction chamber of a compressor, a Pd introduction port arranged upstream of the valve orifice and communicating with a discharge chamber of the compressor, and a Pc inlet/outlet port arranged downstream of the valve orifice and communicating with a crank chamber of the compressor; a main valve element adapted to open or close the valve orifice; an electromagnetic actuator including a plunger and an attractor, the electromagnetic actuator being adapted to move the main valve element in a direction to open or close the valve orifice; a pressure-sensitive chamber adapted to receive a suction pressure Ps from the compressor via the Ps inlet/outlet port; and a pressure-sensitive reaction member adapted to urge the main valve element in the direction to open or close the valve orifice in accordance with a pressure in the pressure-sensitive chamber; wherein the main valve element includes an in-valve release passage for releasing a pressure Pc in the crank chamber to the suction chamber of the compressor via the Ps inlet/outlet port, and a sub valve element adapted to open or close the in-valve release passage is provided; characterized in that the plunger has a cylindrical shape, and the sub valve element is inserted in the plunger, and one or more magnetic bodies made of the same magnetic material as or a different magnetic material from that of the plunger are fixed to at least a part of an inner periphery of an end portion of the plunger that is opposite the attractor in order to increase an attraction force of the electromagnetic actuator.