An image forming apparatus may include a first tray configured to accommodate one or more recording sheets to be supplied to an image forming unit, a pair of body frames disposed to sandwich therebetween an upper part of the first tray, a pair of expansion members disposed under the pair of body frames to sandwich therebetween a lower part of the first tray, a plurality of first connectors configured to connect the pair of body frames with the pair of expansion members, an under bar bridged between the pair of expansion members, and a second connector configured to connect one of the expansion members with the under bar. The expansion member connected with the second connector may be configured such that a phantom line, which extends through the expansion member in a direction parallel to the attaching-detaching direction of the first tray, is in line with the second connector.