An image forming apparatus may include a pressing assembly provided adjacent to the developing device and configured to restrict a movement of the developing device. The pressing assembly may include a rotating shaft formed to extend in a first direction and an operating unit provided at an end of the rotating shaft to be rotated along with the rotating shaft and configured to restrict the movement of the developing device in the first direction. Due to such a structure, the developing device may come into close contact in the installing direction, and also the developing roller of the developing device and the photoreceptor may come into contact with each other.