A mower unit configured to be supported to a work vehicle at a position between front wheels and rear wheels, comprises a mower deck； at least one blade supported by the mower deck； a climb-up assist member in which an inclined surface is formed for assisting the wheels in climbing over the mower unit； and a connecting device for detachably connecting the climb-up assist member to the mower unit in a service position in which the inclined surface assists the wheels in climbing over the mower unit.
