A work vehicle, comprising: a vehicle body that includes a heat exchange room in which an opening portion facing a rear side of the vehicle body is formed, and a rear passage extending in a width direction along a lower edge portion of the opening portion behind the opening portion; a cooling unit that is provided in the heat exchange room and includes a rear surface facing the rear side; a blower unit that includes a fan rotationally driven and a movable shroud covering the fan from an outer peripheral side, and that is supported to be movable with respect to the vehicle body so that a movement region of the blower unit in a plan view overlaps the rear passage between a closed position at which the blower unit faces the rear surface of the cooling unit and an open position at which the blower unit exposes the rear surface of the cooling unit; and a fixation shroud that is provided on the rear surface of the cooling unit in the heat exchange room and forms a flow path through which air is introduced from the rear surface of the cooling unit to the fan along with the movable shroud of the cooling unit positioned at the closed position, characterized in that the fixation shroud has an annular shape and includes a fixed-side step portion and a taper portion, the fixed-side step portion has a flat-plate shape having a surface orthogonal to a forward-backward direction of the vehicle body, the taper portion is connected to the fixed-side step portion and has a shape in which a flow path cross-sectional area decreases from an end portion on an inside in a radial direction of the fixed-side step portion toward the rear side, and the movable shroud has a connection tubular portion having a tubular shape which extends to have a uniform flow path cross-sectional area from a front end of the connection tubular portion toward the rear side, and the front end of the connection tubular portion comes into contact with the fixed-side step portion. a vehicle body that includes a heat exchange room in which an opening portion facing a rear side of the vehicle body is formed, and a rear passage extending in a width direction along a lower edge portion of the opening portion behind the opening portion; a cooling unit that is provided in the heat exchange room and includes a rear surface facing the rear side; a blower unit that includes a fan rotationally driven and a movable shroud covering the fan from an outer peripheral side, and that is supported to be movable with respect to the vehicle body so that a movement region of the blower unit in a plan view overlaps the rear passage between a closed position at which the blower unit faces the rear surface of the cooling unit and an open position at which the blower unit exposes the rear surface of the cooling unit; and a fixation shroud that is provided on the rear surface of the cooling unit in the heat exchange room and forms a flow path through which air is introduced from the rear surface of the cooling unit to the fan along with the movable shroud of the cooling unit positioned at the closed position, characterized in that the fixation shroud has an annular shape and includes a fixed-side step portion and a taper portion, the fixed-side step portion has a flat-plate shape having a surface orthogonal to a forward-backward direction of the vehicle body, the taper portion is connected to the fixed-side step portion and has a shape in which a flow path cross-sectional area decreases from an end portion on an inside in a radial direction of the fixed-side step portion toward the rear side, and the movable shroud has a connection tubular portion having a tubular shape which extends to have a uniform flow path cross-sectional area from a front end of the connection tubular portion toward the rear side, and the front end of the connection tubular portion comes into contact with the fixed-side step portion.