Provided is an image forming apparatus including a main body that is provided with an insertion hole, and forms an image on a recording medium, and an insertion container in which the recording medium is stored, and that is inserted into the insertion hole, wherein the insertion container includes a first part, a second part that extends rearward in a direction of the insertion from the first part, and that is movable forward and backward in the insertion direction with respect to the first part, a fastening tool that fastens the second part to the first part, a releasing tool that releases the fastening tool when grasped, and that moves forward and backward with the second part, and a protruding tool that protrudes from the second part to the main body when the releasing tool is grasped, and that prevents the second part from being inserted into the insertion hole.