To reduce environmental pollution such as noise pollution, dust pollution or the like and to make it possible to very efficiently execute seismic reinforcement.

In order to monolithically connect the exisiting column/beam frame 3 and a new wall 4 placed to the inside thereof from the rear, shear force transferring members 5 transferring the shear force acting on the new wall 4 to the column/beam frame 3 are projected to the inside circumference of the column/beam frame 3, that is to say, the insides of columns 1 and beams 2. The shear force transferring members 5 have approximately T-shaped cross section from flange sections 5a and web sections 5b, the flange sections 5a are fixed to the inside of the column/beam frame 3, and the web sections 5b are projected to the inside of the concrete of the new wall 4. A plurality of anchor bars 8 are projected to the web sections 5b of the shear force transferring members 5.