To provide a paper feeding cassette capable of preventing paper feeding failure caused by the whole deformation of a paper loading plate and deformation such as waviness of the paper loading plate in the width direction.

An engaging piece 10a extending in the direction of an under surface and folded back in a U shape outward, is formed on both ends in the long side direction of a rocking plate 10, and one projection strip 10b extending in parallel to the short side, is formed on the under surface. When arranging the rocking plate 10 in a recessed part 9b of the paper loading plate 9, the rocking plate can laterally rock up to a position rockingly supported by the projection strip 10b and allowing any engaging piece 10a to abut on the under surface of the paper loading plate 9.