PURPOSE: To easily treat discharged soil from excavation by a method in which a pile is driven while excavating the ground by an excavating blade and an expanding blade of a diameter larger than the pile to be driven and discharged soil is introduced into the aperture between the excavated pit and the pile.

CONSTITUTION: A hollow rod 2 is hung down from a pile driver 1, a head 3 is provided at the tip of the rod 2, and an excavator 8 having an expanding blade 5, a screw 6, and an excavating blade 7 is set through a feeding pipe 4 to the tip of the head 3. When excavation is made by the device 1 and a pile 10 is penetrated into the pit, discharged soil 14 goes into the aperture between the pit of a diameter larger than the pile 10 and the pile 10. Thus, the construction work can be performed without the need to particularly treat the discharged soil 14, and concrete 15 supplied through the hollow rod 2 can, after driving the pile 10, be packed to the lower bottom part of the pile 10.