Abstract: An apparatus for sampling dust in a duct for the purpose of knowing, in advance a need for cleaning the inside of such a narrow duct as can not be accessed internally by a person, the kinds of accumulations in the duct and the state of accumulation and sticking or the like. The apparatus comprises a traveling truck enabled to travel forwardly and backwardly in the duct, a TV camera mounted on the traveling truck in order to observe the inside of the duct, a sampling bucket attached to the front of the traveling truck in order to sample accumulations in the duct and a remote control portion for remotely controlling the traveling truck, the TV camera and the sampling bucket.