A control valve (1, 201) for controlling a flow of refrigerant in a refrigeration cycle, the control valve (1, 201) comprising: a body (2, 202) having a lead-in port through which the refrigerant is led in, a lead-out port through which the refrigerant is led out, and a valve hole formed in a refrigerant passage joining the lead-in port to the lead-out port; a valve element that opens and closes a valve section by moving toward and away from the valve hole; a drive section that generates a drive force used to open and close the valve section; a shaft one end side of which connects to a movable member of the drive section and an other end side of which connects to the valve element, the shaft transmitting the drive force, generated by the drive section in a direction of axis line, to the valve element, wherein the shaft is so provided as to run through an insertion hole formed in the body (2, 202); and a sliding mechanism that directly or indirectly applies a sliding resistance to an actuation of the valve element, wherein the sliding mechanism includes a sliding member (50, 250), which is provided between the valve element or the shaft and an inner surface (46, 19) of the body (2, 202) and which is elastically deformed in a radial direction of the inner surface (46, 19), characterised in that an outer surface of the shaft or the inner surface of the body has a contact face which the sliding member (50, 250) elastically comes in contact with and slides along in the direction of axis line, and a friction between the contact face and the sliding member (50, 250) generates the sliding resistance, and wherein the outer surface of the shaft or the inner surface of the body includes such a shape that the contact face has a diameter varying with a position in the direction of axis line so that a distance between a contact point, of the sliding member (50, 250) and the contact face, and the axis line of the shaft varies with a position of the valve element within a movable range of the valve element, so that a magnitude of the sliding resistance affecting the valve element is varied by the position of the valve element in the direction of axis line in the body (2, 202). a body (2, 202) having a lead-in port through which the refrigerant is led in, a lead-out port through which the refrigerant is led out, and a valve hole formed in a refrigerant passage joining the lead-in port to the lead-out port; a valve element that opens and closes a valve section by moving toward and away from the valve hole; a drive section that generates a drive force used to open and close the valve section; a shaft one end side of which connects to a movable member of the drive section and an other end side of which connects to the valve element, the shaft transmitting the drive force, generated by the drive section in a direction of axis line, to the valve element, wherein the shaft is so provided as to run through an insertion hole formed in the body (2, 202); and a sliding mechanism that directly or indirectly applies a sliding resistance to an actuation of the valve element, wherein the sliding mechanism includes a sliding member (50, 250), which is provided between the valve element or the shaft and an inner surface (46, 19) of the body (2, 202) and which is elastically deformed in a radial direction of the inner surface (46, 19), characterised in that an outer surface of the shaft or the inner surface of the body has a contact face which the sliding member (50, 250) elastically comes in contact with and slides along in the direction of axis line, and a friction between the contact face and the sliding member (50, 250) generates the sliding resistance, and wherein the outer surface of the shaft or the inner surface of the body includes such a shape that the contact face has a diameter varying with a position in the direction of axis line so that a distance between a contact point, of the sliding member (50, 250) and the contact face, and the axis line of the shaft varies with a position of the valve element within a movable range of the valve element, so that a magnitude of the sliding resistance affecting the valve element is varied by the position of the valve element in the direction of axis line in the body (2, 202).