To improve evaluation of earthquake resistance without performing a large-scale seismic strengthening.

In a building in which a wall 4 is formed integrally with pillars 1 and beams 2 in the inside of a frame 3 consisting of the pillars 1 and the beams 2 and vertical slits S having beam yield strength depression effect are provided in the end side parts in the width direction of the wall 4, a horizontal clearance L between the vertical slit S and the end of the wall 4 is set so that the yield strength of the beam 2 at the position of a joint G of the pillar 1 and the beam 2 increases without exceeding the yield strength of the pillar 1.