A toner supplying device which supplies toners contained in a toner container to a developing device is disclosed. The toner supplying device includes a toner tank which stores the toners discharged from the toner container, a toner carrying section which carries the toners stored in the toner tank, a toner dropping route which causes the toners carried by the toner carrying section to drop into the developing device by toner's own weight, a control unit which controls an amount of the toners to flow into the toner dropping route from the toner carrying section, and a stirring member which stirs the toners staying at a region between the toner tank and the toner carrying section.