A portable screen and a portable screen device that have an extremely simple structure, can be manufactured at low cost, and can easily be converted to a service state from an unused state in which the screen can be carried, without the need for an accessory. The portable screen comprises a screen part (1) that is capable of changing shape between an upright service state and a folded state, and a support body (2) for supporting the screen part (1) in the upright service state, wherein a protruding part (9) that protrudes toward a back surface of the screen part (1) is provided to the support body (2), and the protruding part (9) makes contact with a back surface of the screen part (1) to prevent the left screen body (3) and the right screen body (4) from naturally closing when the screen part (1) is in the upright service state.