A rear gate arranged at a rear end of a cargo bed of a truck includes: a support frame arranged at the rear end of the cargo bed and extending along a vehicle width direction; a pair of first and second gate frame bodies arranged at both ends in the vehicle width direction of the support frame; and a first divided gate and a second divided gate supported openably from the first and second gate frame bodies. The rear gate includes a pair of first and second opening/closing switching units configured to switch an opened/closed state of the rear gate. Operation levers of the first and second opening/closing switching units are operated to switch among a vertical opening state, a horizontal opening state, and a locked state restricting from the vertical opening and the horizontal opening.