To provide a reinforcing metal fittings for a groundsill and structural members capable of fixing the groundsill to footing not only for a newly built building but also for an existing building.

This reinforcing fittings for groundsill and structural member is made of steel with the surface plated with nickel-chrome comprising an upper cylindrical coupling body, an upper main body having a plurality of upper main body attaching holes, a lower cylindrical coupling body, a plurality of lower main body attaching holes as the lower main body, and a bolt and a nut for coupling and fixing the upper main body to the lower main body.