To provide a driving device more improved in performance in regard to a driving device for driving a driven body and a conveying device for conveying a recording material.

In the case of rotating a conveying roller 51 in the normal direction, a motor M2 is excited and a driving gear 64 is stopped. When a motor M1 is driven in this state, a driving gear 61a and a gear case 82 are driven into rotation, and the conveying roller 51 is rotated in the normal direction. On the other hand, when the motor M2 is driven and a first bevel gear 88a is rotated at a rotation speed higher than that of the gear case 82, a first planetary gear 87a and a second planetary gear 87b are reversely rotated, and respectively rotated in a direction expressed with an arrow in the figure. As a result, a second bevel gear 88b and a second rotary shaft 81b are also reversely rotated, and respectively rotated in a direction expressed with an arrow in the figure. When the second rotary shaft 81b is rotated in a direction expressed with an arrow F in the figure, the conveying roller 51 is rotated in a direction (reverse direction) expressed with an arrow G in the figure.