A control object model generation device of this invention includes a simulation computing unit (5) which executes simulation of a control system including a controlled system represented by a mathematical model and a controller represented by a controller algorithm, a model control feature amount computing unit (8) which computes a model control feature amount from the simulation result, an evaluation function computing unit (9) which computes an evaluation function value indicating the similarity between a real control feature amount obtained from a control result on an actual controlled system and a model control feature amount, and a controlled system model parameter search computing unit (10) which executes simulation while sequentially changing the values of controlled system model parameters set in the mathematical model, and obtains controlled system model parameters which optimize the evaluation function value.