An image forming apparatus includes an apparatus main body with a main conveyance path, a first storage portion including a first conveyance path, a second conveyance path and a joint section. The joint section is a part where an upstream end of the main conveyance path and downstream ends of the first and second conveyance paths join. The first storage portion includes a movable guide at the position of the downstream end of the first conveyance path. The movable guide is displaced to a projecting position where the movable guide projects toward the joint section from the downstream end of the first conveyance path to guide the sheet in a state where the first storage portion is mounted in the apparatus main body and a retracted position substantially retracted from the joint section in a state where the first storage portion is withdrawn from the apparatus main body.