A medium supporting unit includes a supporting unit including a supporting face which supports a medium, and a receiving unit in which a receiving face which is recessed with respect to the supporting face is formed; and a pressing unit which can press the medium which is supported by the supporting unit by being received on the receiving face, in which the receiving unit is formed of a material of which rigidity is higher than a material which forms the supporting face. By configuring such a medium supporting unit, it is possible to make the supporting unit thin and light weight.