To decrease 3 machine height, and uniformalize braking force relating to a roller, by adopting a hollow member elastically expanded by charging of fluid as a working mechanism of a brake device, in the brake device in a roller conveyer.

Between a bottom surface plate 9 mounted in a machine frame 4 and a brake member 6 comprising an upper surface plate 8 and a friction member 7, a rubber tube 10 is interposed. Through an air pipe 11, when the rubber tube 10 is charged with air, by elastic deformation of the rubber tube 10, the friction member 7 is friction engaged from downward with a peripheral surface of a roller 5 of a roller conveyer 3, braking force is given relating to rotation of the roller 5, a speed of an object 30 conveyed on the roller 5 is limited. A height of the rubber tube 10 is low, a machine height of the roller conveyer is also low suppressed. The brake member 6 gives uniform braking force to a plurality of the rollers 5.