PURPOSE: To reduce the weight of a force transfer body by reducing a pressure load per unit area for concrete at a structure part.

CONSTITUTION: A force transfer body is provided with a nearly ring-shaped first part 5 that is made of especially cast steel and a second part 6 that is made of especially pouring and curable mortar. The second part is cast to the first part. The first part is provided with a contact surface at the opposite side of a structure part 9. The second part is formed nearly in a truncated cone shape. Shoulder parts 7b and 7c are provided in the range of the outer- periphery surface of the second part. An annular surface 7b that is formed by the shoulder parts transfers tension force to the structure part 9 in addition to a small end face 7d at the opposite side of the first part.