To provide ridge reinforcing hardware for improving strength against horizontal force at an earthquake.

This ridge reinforcing hardware is characterized in that one of two pieces bent in a V shape is formed as an installing piece 3 fixed to the roof plate 1 side, the other piece is formed as a support piece 5 fixed to one side surface of a core material 4 run along a roof top part, and a first rib 6 for holding a bending angle α of the installing piece 3 and the support piece 5 is provided in a corner part formed of the installing piece 3 and the support piece 5.