To provide a pile head joining structure of a steel pipe concrete pile and footing slab concrete reduced in the number of anchoring reinforcing bars, and improved in the execution performance of work.

This pile head joining structure includes a plate 5 the inside of which is partially attached to the top face of an end plate 4 of a steel pipe 2, and two rib plates 6 hung down from a part of the outside of the plate 5 and attached to the outer peripheral surface of the steel pipe 2, wherein the reinforcing bar 3 is erected on the plate 5, and the rib plates 6 are welded to the outer peripheral surface of the steel pipe 2.