Provided is a work vehicle in which a reducing agent tank can be easily replenished with a reducing agent. A reducing agent tank (36) comprises a tank body, and a liquid supply tube. The tank body stores a reducing agent that is to be supplied to an exhaust gas treatment device. The liquid supply tube protrudes from the tank body. The liquid supply tube is provided for replenishing the tank body with the reducing agent. A support platform (100) supports a container for the reducing agent with with the reducing agent tank (36) is to be replenished. The orientation of the support platform (100) can be changed between a deployed orientation, in which the support platform (100) is positioned further from the tank body than the liquid supply tube in the direction in which the liquid supply tube protrudes from the tank body in planar view, and a storage position, in which the support platform (100) is stored to the inside of an exterior cover.