The present invention provides a conveying driving device capable of suppressing the current consumption of a motor at the time of stabilization when the same drive shaft is driven by two motors at different torques. The conveying driving device of the invention includes a first motor which transmits power to the drive shaft (171a) of a roller (171); a second motor (220) which transmits power to the drive shaft along with the first motor at a torque smaller than that of the first motor; and a controller (110) which sets each of drive current setting values of the first motor and the second motor so that a total value of a consumption current of the first motor and the second motor becomes minimal in a steady state in which the roller rotates at a constant setting speed.