An image forming apparatus that includes: an image carrier on which an electrostatic latent image is formed; a developing agent carrier which supplies developing agent to the image carrier; a linear movement member which reciprocally and substantially linearly moves between a pressing position for pressing the developing agent carrier against the image carrier and a releasing position for releasing pressure; a drive source; a cover which is provided on a body of the apparatus so as to be opened and closed; a first input member which inputs a driving force from the drive source to the linear movement member as a force for moving the linear movement member; and a second input member which inputs a force for moving the linear movement member in conjunction with an opening motion of the cover.