A slide restricting member for restricting detachment of a feed roller which is rotatably supported and which is detachably held in an axial direction is held at a lock release position for allowing the detachment of the feed roller by a rib of a sheet feeding frame, a projection of an auxiliary member, and a snap fit. When the feed roller is mounted on the sheet feeding frame, the slide restricting member positioned at the lock release position is moved to a lock position in conjunction with a mounting operation of the feed roller.