PROBLEM TO BE SOLVED: To provide a buckling load calculation method capable of accurately calculating a buckling load while shortening an analysis time including a model creation time as much as possible and eliminating complicated modeling. SOLUTION: This is a buckling load calculation method in which a frame model of a building frame is created and a buckling load is calculated in a computer. The frame model formed by the A frame including the columns and the beam connecting the long columns and the A frame is the first having the layer rigidity of the long columns, the beams, the general columns on the side of the long columns, and the A frame. It has a step of replacing the brace with a replacement frame model including a long column-containing floor replacement frame formed by the brace, and a step of performing a buckling specific value analysis on the replacement frame model and calculating a buckling load. [Selection diagram] Fig. 6
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