To provide a boring drill for quickly discharging waste, after boring.

A power motor is combined with a screw shaft 2 and a drill head axis shaft 1 and is constituted by coupling this combination with a frame by a fixing plate 21. The axis of the power motor transmits the drill head axis shaft 1 directly. Several drill blades 12 are provided in an outer peripheral position of a drill head 11 of the drill head axis shaft 1, and an inlet port 13 of a cutout shape is formed above the drill blades 12. The screw shaft 2 on the outer periphery of the drill head axis shaft 1 meshes, by combining a main drive gear 22 and a planetary gear 23 in the fixing plate 21, and two rotary plates 24 are integrally coupled. If the axis 31 rotates, the main drive gear 22 on the outer periphery of the drill head axis shaft 1 rotates at a high speed, by directly transmitting through the drill head axis shaft 1.