A surface moving body includes an endless surface that is capable of
making an endless movement. A surface-moving-body drive mechanism
includes a driving source of a driving force for moving the surface
moving body and a drive transmission mechanism for transmitting the
driving force from the driving source to the surface moving body. At
least a part of the surface-moving-body drive mechanism is arranged in a
surface-moving-body occupying space surrounded by two surfaces defined by
ends of the endless surface in a width direction orthogonal to a surface
moving direction of the endless surface and the endless surface.