To provide a pile head processing construction method easily and surely removing an extra fill part at low cost and capable of significantly reducing noise.

In a pile head processing construction method, a device 10 consisting of flat bars 12, 14 and a device 30 consisting of flat bars 14, 22, 24 are installed at a top end of a reinforcement cage 100. The reinforcement cage 100 provided with the devices 10, 30 is built in a pile hole 200. Next, concrete 400 is placed in the pile hole 200. Then, an extra fill part 4A of a cast-in-place pile is exposed. And then, a part 400a present on an outer side of reinforcements 50 in the extra fill part 4A is removed by driving break-up metal fittings 70 between the flat bars 12 and 14 and between the flat bars 14 and 22. After that, a bottom of a part 400b present inside the plurality of reinforcements 50 in the extra fill part 4A is crushed by driving a break-up metal fitting 70 between the flat bars 22, 24.