A wireless packet transmission apparatus of this invention includes a packet priority controller that controls the order of transmitting packets with different priorities, and an adaptive modulation controller that changes the modulation scheme of the packets. The packet priority controller includes: a schedule selector that, when a modulation scheme is changed, with respect to packets with a priority of a predetermined value or more, provisionally sets a strict priority control scheme; and a comparison section that compares the transmission rate of the packets for which the strict priority control scheme is provisionally set and the transmission rate of the wireless packet transmission apparatus that is determined by the modulation scheme that has been changed by the adaptive modulation controller. Based on the comparison result, the schedule selector determines whether or not to set the strict priority control scheme for the packets for which the strict priority control scheme is provisionally set.