To provide a boundary condition setting method capable of shortening calculation time and obtaining good solution convergence while obtaining an appropriate analysis result when performing spot welding simulation.SOLUTION: A method for setting a constraint condition in a numerical simulation in which the constraint condition is given to an end portion of an analysis model and a load is applied to the analysis model to perform analysis, comprises: convergence determination processing including a process of comparing a time step ΔTduring analysis with a preset time step ΔT; and constraint condition resetting processing for changing the constraint condition when ΔTbecomes ΔTor less in the convergence determination processing.SELECTED DRAWING: Figure 3
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