A sheet material feeding device includes a send-out means that is pressed to contact with the uppermost surface of the sheet material stacked on the sheet material stacking member to move the contact surface in a predetermined direction for sending out the sheet material, a lift up/down means that moves the sheet material stacking member between a feeding position and a separate position, a member to be detected that can move in the up and down direction when the sheet material stacking member moves, a detecting member that can output a detection signal when the member to be detected moves to a predetermined position, and a cassette that supports the sheet material stacking member and can be attached and detached from an apparatus main body. The cassette has an engaging portion for moving the member to be detected to the predetermined position when being attached to the apparatus main body.