In a powder supplying device which supplies powder to a powder receiving device, a powder container unit contains powder therein and is provided at a bottom of the powder container unit with a gas blowing part which blows gas to the inside of the powder container unit. A suction tube has a suction opening and attracts powder contained in the powder container unit from the suction opening. A powder transporting unit transports powder attracted by the suction tube, to the powder receiving device. The suction tube is arranged in a vicinity of a side wall of the powder container unit.