A versatile device for installing a run channel for an automobile, capable of contributing to man-hour reduction and being used for multiple models. A device for installing a run channel on a sash of an automobile door, the device being composed of a robot having a pair of arms and a run channel installation jig (3) provided on each of the arms. The run channel installation jig (3) has a first holding means (10) for holding both corner sections of the run channel, a pressing means (11) for pressing and fitting both corner sections of the run channel held by the first holding means (10) into corner sections of an upper sash, a rotatable upper-sash roller (12) pressing and fitting the run channel into the upper sash, a second holding means (13) for holding both end sections of the run channel, a rotatable lower-sash roller (14) for pressing and fitting the run channel into a lower sash, and a slide means (15) for arbitrarily setting the distance of the second holding means (13) and the lower-sash roller (14) relative to the first holding means (10).