PROBLEM TO BE SOLVED: To provide a non-linear structure analysis calculation device, a non-linear structure analysis calculation method and a non-linear structure analysis calculation program, for efficiently calculating analysis of a non-linear structure.SOLUTION: A control section 21 of a behavior analysis device 20 executes LU decomposition processing for each of block diagonal matrices obtained by removing edges from block diagonal matrices with edges, on the outside of a loop of a time step to calculate a lower triangular matrix and an upper triangular matrix. The control section 21 executes processing for generating the matrix corresponding to the edge satisfying a contact condition when there is a contact in the loop of the time step. The control section 21 identifies factors land uobtained by the LU decomposition of the generated matrix corresponding to the edge, and combines the factors with the lower triangular matrix and the upper triangular matrix, respectively, to generate the matrices to be processed. The control section 21 repeatedly calculates a velocity correction amount from the matrices to be processed by using forward substitution and backward substitution to update displacement {U}, velocity {V} and acceleration {A}, to thereby calculate displacement {U}, velocity {V} and acceleration {A} of the time step.
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