An electric brake device to be mounted on a vehicle, the electric brake device comprising: a rotating body which rotates together with a wheel; a friction member which generates a braking force due to friction with the rotating body by being pressed against the rotating body; an electric motor serving as a drive source; an actuator comprising a piston (42a; 86; 142) and an operation conversion mechanism configured to convert a rotation of the electric motor into a forward and backward movement of the piston (42a; 86; 142) and being configured to press the friction member against the rotating body by forward movement of the piston (42a; 86; 142); and a controller configured to control the actuator by controlling the rotation of the electric motor, wherein: the operation conversion mechanism is configured to include a rotating member that has one of a male screw and a female screw threadedly engaged with each other in a state where a lubricant is interposed, and the rotating member being rotatable by the rotation of the electric motor, and a linear motion member that has the other of the male screw and the female screw and adapted to be movable forward and backward to move the piston (42a; 86; 142) forward and backward; and the controller selectively executes, when there is no braking force request for the electric brake device, (a) a standby control of causing the linear motion member to stand by at a standby position where a clearance between the friction member and the rotating body is not larger than a backlash between the male screw and the female screw, and (b) a backward movement control of moving the linear motion member backward to a backward movement position where the clearance is allowed to be equal to or more than the backlash, characterised in that the backward movement control includes a control for moving the linear motion member forward up to the standby position after the linear motion member is moved backward up to the backward movement position. a rotating body which rotates together with a wheel; a friction member which generates a braking force due to friction with the rotating body by being pressed against the rotating body; an electric motor serving as a drive source; an actuator comprising a piston (42a; 86; 142) and an operation conversion mechanism configured to convert a rotation of the electric motor into a forward and backward movement of the piston (42a; 86; 142) and being configured to press the friction member against the rotating body by forward movement of the piston (42a; 86; 142); and a controller configured to control the actuator by controlling the rotation of the electric motor, wherein: the operation conversion mechanism is configured to include a rotating member that has one of a male screw and a female screw threadedly engaged with each other in a state where a lubricant is interposed, and the rotating member being rotatable by the rotation of the electric motor, and a linear motion member that has the other of the male screw and the female screw and adapted to be movable forward and backward to move the piston (42a; 86; 142) forward and backward; and the controller selectively executes, when there is no braking force request for the electric brake device, (a) a standby control of causing the linear motion member to stand by at a standby position where a clearance between the friction member and the rotating body is not larger than a backlash between the male screw and the female screw, and (b) a backward movement control of moving the linear motion member backward to a backward movement position where the clearance is allowed to be equal to or more than the backlash, characterised in that the backward movement control includes a control for moving the linear motion member forward up to the standby position after the linear motion member is moved backward up to the backward movement position. the operation conversion mechanism is configured to include a rotating member that has one of a male screw and a female screw threadedly engaged with each other in a state where a lubricant is interposed, and the rotating member being rotatable by the rotation of the electric motor, and a linear motion member that has the other of the male screw and the female screw and adapted to be movable forward and backward to move the piston (42a; 86; 142) forward and backward; and a rotating member that has one of a male screw and a female screw threadedly engaged with each other in a state where a lubricant is interposed, and the rotating member being rotatable by the rotation of the electric motor, and a linear motion member that has the other of the male screw and the female screw and adapted to be movable forward and backward to move the piston (42a; 86; 142) forward and backward; and the controller selectively executes, when there is no braking force request for the electric brake device, (a) a standby control of causing the linear motion member to stand by at a standby position where a clearance between the friction member and the rotating body is not larger than a backlash between the male screw and the female screw, and (b) a backward movement control of moving the linear motion member backward to a backward movement position where the clearance is allowed to be equal to or more than the backlash, characterised in that the backward movement control includes a control for moving the linear motion member forward up to the standby position after the linear motion member is moved backward up to the backward movement position.