Provided is a simulation device for a simulation of a cooperative task carried out cooperatively by a cooperative robot and a person, and the simulation device includes a head mounting-type display device to be mounted on an operator to simulatively carry out the cooperative task, a detecting section configured to detect a position of the operator in a real space, a three-dimensional model display section configured to cause an image in which a robot system model including a cooperative robot model is arranged in a three-dimensional virtual space to be displayed on the head mounting-type display device, and a simulation execution section configured to simulatively operate the cooperative robot model in the three-dimensional virtual space based on an operation program of the cooperative robot to carry out the cooperative task and the detected position of the operator.