An image forming apparatus includes first and second conveying members arranged with an axial angle, for conveying toner in first and second containers, and a conveying driving portion. The conveying driving portion includes a motor, a first gear, a second gear, a third gear, a swing gear, an idle gear, and a fourth gear. The second gear is fixed coaxially with the rotary shaft of the second conveying member. The swing gear swings on the outer circumference of the first gear rotated by a motor and meshes selectively with one of the second and third gears. The idle gear meshes with the third and fourth gears. The fourth gear has an axial angle between its input and output shafts and is fixed coaxially with the rotary shaft of the first conveying member.