PURPOSE: To isolate vibration so as to reduce noise by providing a guide mounting device for an endless chain for driving an endless conveyer belt, in which guides for the endless chain provided at a side edge of the endless chain are attached to a support device for the endless conveyer belt, the endless chain and a drive device through the intermediary of a vibration isolation attaching device.

CONSTITUTION: An endless chain 10 which is attached to an outer side edge part 6 of an endless conveyer belt 4 by means of an attaching device 12 is guided by upper and lower guides 14, 16. A first support member 42 is attached to a slidable floor 24 which supports the endless conveyer belt 4, at an upper side edge part 46 thereof. Further, a second support member 52 is attached at its upper end part 54 to the upper guide 14 by an attaching device 58, and at its lower end part 16 to the lower guide 16 through the intermediary of an attaching device 60. In this arrangement, a sandwich-like attaching part 62 of a vibration isolating device 40 is interposed between a flange 48 of the first support member 42 and the second support member 52.