To provide a structure and the constructing method in which so much time and cost are not required for manufacturing the parts of a connecting section of the base part of a bridge pier main body with a footing, when the bridge pier main body of a road bridge, a railway bridge, or the like is to be erected in the footing.

The base part of a bridge pier main body 1 and the connecting part of a footing 2 are connected together so that a flange-shaped base plate 4 fixedly fitted to the lower part of the bridge pier main body is mounted on the threaded rib reinforcement group 5 erected in the footing 2. Consequently, by using the threaded rib reinforcement as general purpose steel. The connecting part of the bridge pier main body base part with the footing can be easily constructed at low cost.