Abstract: The present invention relates to a helically guided endless belt conveyor constituted of a conveyor belt comprising on the inside struts to determine the pitch of the spires and on the outside members resting on helical guide means.Said belt is provided on its inside edge with a series of fingers which are selectively engaged in vertical grooves of a central driving drum so as to guide the belt along an upward or downward helical course.The invention finds an application in the production of helical conveyors.