A sheet supporting apparatus includes an apparatus body, a supporting unit being capable of being drawn from and inserted to the apparatus body, and having a supporting member on which a sheet is supported, a conveyance guide disposed on the apparatus body and being capable of moving to a first position at which a sheet conveyance path is constituted, and a second position distant from the first position, and a regulation unit. The regulation unit regulates the conveyance guide positioned at the second position from moving in an upward direction, a downward direction, a drawing direction and an inserting direction of a supporting unit.