To provide the optimum constitution for transmitting the torque and to provide a module capable of preventing thick cross ribs.

First link end parts 115 are mounted in the advancing direction of a belt 100, and second link end parts 118 are mounted in the opposite direction. The second link end parts are offset from the first link end parts so that the first link end part of one belt module can be fitted and inserted into a clearance between the second link end parts of the adjacent belt modules. Intermediate parts are formed for connecting the first link end parts to the second link end parts. The intermediate parts respectively have plural first cross rib parts 130 facing to the first direction and plural second cross rib parts 130 facing to the second direction opposite to the first direction. The cross lib parts have a face capable of being engaged with a tooth part of a sprocket, and alternately mounted at opposite sides with respect to a central line of the module.