In a sheet stacking apparatus, a first notch portion in which a first limiting member is movable and a second notch portion in which a second limiting member is movable are formed in a stacking surface of a stacking unit, and the first and second notch portions are arranged such that a minimum distance between the first notch portion and a center of the stacking unit in the widthwise direction is shorter than a minimum distance between the second notch portion and the center of the stacking unit in the widthwise direction.