To provide a repair structure of an infilling structure and a protective body attaching metal fitting used for it.

An infilling structure 22 includes a steel frame 32 having steel column materials 1 arranged at an interval in a right-left direction and a front-back direction, horizontal screen materials 4 for connecting the column materials 1 adjacent to each other in the right-left direction and girth 33 for connecting the column materials adjacent to each other in the front-back direction, and an infilling material is filled inside the steel frame 32. At the respective column materials 1 adjacent to each other at an interval in the right-left direction, protective body attaching metal fittings 7 having holding means on one end side and having a protective body attaching part 8 on the other end side are disposed so as to face other respectively, the protective body attaching metal fittings 7 are attached to the column materials 1 respectively so as to hold the column materials 1 by the holding means 1, a protective body 20 for repair is disposed so as to cover the front surface side of the horizontal screen material 4 over the protective body attaching parts 8 of the respective protective body attaching metal fittings 7 adjacent to each other so as to face each other, and a protective body 29 is attached to the protective body attaching parts 8 of the respective protective body attaching metal fittings 7.