A toner supply device controls at what position a joint receiving section stops, using a position detection sensor. By doing so, the rotation of a toner container is stopped at a position where a toner exit is above the boundary surface of toner. Therefore, in a developer supply device in which the toner container rotates, at what position the rotation of the toner container stops is controlled, so that members such a shutter properly operate and toner supply is stably carried out.