An image forming apparatus includes: a casing including a base portion, an access assembly, and a cover; first and second engaging portions; and an operating member. The access assembly is pivotally movable between an open position and a closed position. The cover has a recessed portion recessed from an edge thereof in a direction away from the access assembly in the closed position. The first engaging portion overlaps the cover as viewed from above. The second engaging portion is movable between an engaged position engageable with the first engaging portion and a disengaged position disengaged from the first engaging portion. The operating member is in the recessed portion when the access assembly is in the closed position, and movable between a lock position to lock the second engaging portion into the engaged position and an unlock position to unlock the second engaging portion into the disengaged position.