An image forming apparatus, in which carrying paths for carrying the toner discharged from image forming portion are mutally connected, is capable of stable operation with satisfactory toner carrying at the connecting portion and not causing toner clogging. Preferably the image forming apparatus is low in cost and capable of smooth toner carrying even in case a toner carrying direction is an upward carrying direction. The image forming apparatus includes a plurality of toner carrying paths incorporating toner carrying screws, wherein an aperture is formed on a lateral face of each of the carrying paths, and, an aperture of an upstream carrying path and an aperture of a downstream carrying path are mutually opposed to connect the plurality of carrying paths. An angle formed by a toner carrying direction of the downstream toner carrying path and a gravitationally downward direction is larger than that in the upstream toner carrying path, and a carrying amount per unit time of the toner carrying screw of the downstream toner carrying path is made to be larger than a conveying amount per unit of the carrying screw in the upstream toner carrying path.