A toner supply device includes a toner cartridge, a cartridge driving source, a toner detection sensor, a conveyance member which conveys toner, and a rotating member driving source which drives the conveyance member. In addition, a driving controller controls the rotating member driving source, and a controller controls a series of replenishment operations of the toner cartridge based on a detection result of the toner detection sensor. The series of replenishment operations of the toner cartridge is controlled based on information about driving of the conveyance member, which is acquired at every predetermined period after starting the series of replenishment operations.