A control valve driven by a solenoid controlled by pulse width modulation, the control valve comprising: a body having a first port through which a working fluid is introduced, a second port through which the working fluid is delivered, and a valve seat provided in a passage connecting the first port and the second port; a valve element configured to touch and leave the valve seat to close and open a valve section; an actuating member (34, 54, 68) driven in a direction of an axis line to transmit a driving force of the solenoid to the valve element; and a vibration absorbing member (100, 120, 122, 130, 140, 214) having viscoelasticity, the vibration absorbing member (100, 120, 122, 130, 140, 214) being set between the body and the actuating member (34, 54, 68) or between a fixed member (72, 376) fixed to the body and the actuating member (34, 54, 68), wherein a material and a structure of the vibration absorbing member (100, 120, 122, 130, 140, 214) are set such that, during stationary control of a valve opening degree, the vibration absorbing member (100, 120, 122, 130, 140, 214), having the viscoelasticity, dynamically deforms following vibration of the actuating member (34, 54, 68) accompanying the PWM control, and such that a vibration amplitude of the actuating member (34, 54, 68) is included in a range in which the vibration absorbing member (100, 120, 122, 130, 140, 214) and the actuating member (34, 54, 68) are not caused to slide relative to each other, characterized in that the vibration absorbing member (100, 120, 122, 130, 140, 214) is a viscoelastic solid, and wherein during the stationary control, an inner peripheral portion of the vibration absorbing member (100, 120, 122, 130, 140, 214) dynamically deforms following vibration of the actuating member (34, 54, 68) so that the vibration absorbing member (100, 120, 122, 130, 140, 214) does not receive a dynamic friction resistance from the actuating member (34, 54, 68). a body having a first port through which a working fluid is introduced, a second port through which the working fluid is delivered, and a valve seat provided in a passage connecting the first port and the second port; a valve element configured to touch and leave the valve seat to close and open a valve section; an actuating member (34, 54, 68) driven in a direction of an axis line to transmit a driving force of the solenoid to the valve element; and a vibration absorbing member (100, 120, 122, 130, 140, 214) having viscoelasticity, the vibration absorbing member (100, 120, 122, 130, 140, 214) being set between the body and the actuating member (34, 54, 68) or between a fixed member (72, 376) fixed to the body and the actuating member (34, 54, 68), wherein a material and a structure of the vibration absorbing member (100, 120, 122, 130, 140, 214) are set such that, during stationary control of a valve opening degree, the vibration absorbing member (100, 120, 122, 130, 140, 214), having the viscoelasticity, dynamically deforms following vibration of the actuating member (34, 54, 68) accompanying the PWM control, and such that a vibration amplitude of the actuating member (34, 54, 68) is included in a range in which the vibration absorbing member (100, 120, 122, 130, 140, 214) and the actuating member (34, 54, 68) are not caused to slide relative to each other, characterized in that the vibration absorbing member (100, 120, 122, 130, 140, 214) is a viscoelastic solid, and wherein during the stationary control, an inner peripheral portion of the vibration absorbing member (100, 120, 122, 130, 140, 214) dynamically deforms following vibration of the actuating member (34, 54, 68) so that the vibration absorbing member (100, 120, 122, 130, 140, 214) does not receive a dynamic friction resistance from the actuating member (34, 54, 68).