A power rail-support unit includes: a base portion that is integrally fixed on a track; a guide rail on which a guide wheel of a side portion of a vehicle travelling on the track abuts; a first fixing portion that is configured to fix the guide rail on the base portion; a second fixing portion that is connected to the guide rail so as to be independent of the first fixing portion; a bracket that is supported on the guide rail; and a power rail that is supported by the bracket so as to be arranged at a predetermined relative position relative to the guide rail, and that slides on and makes contact with a collector of the vehicle.