In one embodiment, an image forming apparatus has a discharge portion and a guide member. The discharge portion has a space surrounded by wall surfaces of a chassis, and a side opening portion to open the space. The discharge portion receives a sheet to be discharged from a discharge port of the chassis, and houses the sheet in the space so that the sheet can be taken out from the side opening portion. The guide member is arranged at an end portion in the side opening portion, and extends toward upward from the rear side toward the front side of the chassis.