To provide a belt conveyor of a structure having a hydraulic motor disposed inside a conveyor frame.

In a drive mechanism of this conveyor provided with a drive roller 2, a hydraulic motor 5, and a roller shaft 8, the hydraulic motor 5 is contained in an inner case 4 as a separate body, a motor containing part of the inner case 4 is installed in a hollow inside the drive roller 2, an outer end part of the inner case 4 is fixed to one conveyor frame 1A, head parts 8A of the roller shaft 8 are respectively connected to side plates of the hydraulic motor 5 and the drive roller 2, and an outer end part of the roller shaft 3 is rotatably held on the other conveyor frame 1B.