Abstract: With a simple structure, an accumulation conveyor can reduce the distance between articles to be conveyed, so as to improve its efficiency and conveyance efficiency. The accumulation conveyor in accordance with the present invention comprises a motor, provided for each zone, for driving a carrier roller constituting the zone to rotate; a sensor, provided for each zone, for detecting passing of an article to be conveyed; and control means for estimating according to detection information of two articles adjacent to each other detected by the sensor distance information concerning the distance between the articles and switching, when the estimated distance information falls within a predetermined range, a control input to a motor of a zone conveying the article at the back on the upstream side or a motor of a zone adjacent downstream thereto such that the zone has conveying speed faster than that of the zone.