Provided is a transportation vehicle having a duct device mounting structure which facilitates the mounting and removal of sound absorbing ducts to and from the vehicle body to improve work efficiency and which enables the sound absorbing ducts to be advantageously stored when the sound absorbing ducts are removed. An opening section for introducing air to the radiator of the engine mounted on the vehicle body (1) of a transportation vehicle is divided by a support frame member (24). Sound absorbing ducts (17a, 17b) are respectively mounted to the regions of the opening section divided by the support frame member (24). The sound absorbing ducts (17a, 17b) are formed by adhering sound absorbing materials to the inner walls of air paths.