An image forming apparatus includes a photosensitive member and a transfer roller that are brought into pressure contact with each other by a force of a transfer spring to define a nip section therebetween. The transfer roller is movable between a first position at which the transfer roller is in pressure contact with the photosensitive member and a second position at which the pressure is eliminated or reduced. When the transfer roller is pushed to the second position, the transfer roller is latched at the second position and the apparatus can be carried in this state. When the apparatus is activated and the photosensitive member is driven, the transfer roller is unlatched and is returned to the first position by the force of the transfer spring, so that the nip section is formed again between the transfer roller and the image bearing member and an image forming process is enabled.