A simulated driving system makes it possible to ensure safety during testing and to simulate driving of a vehicle or a part thereof while acquiring travel data from a vehicle traveling on a road. The simulated driving system reproduces the travel state of a vehicle on a road by acquiring travel data transmitted sequentially by wireless communication from the vehicle while the vehicle travels on a road and meanwhile using the travel data as a basis to simulate driving of a vehicle that is a test body. The simulated driving system is provided with an automatic driving device that automatically drives the test body, a dynamometer that applies a load to the test body, and a control device. The control device comprises a control unit that controls the automatic driving device or the dynamometer so that the test body enters a predetermined safe driving state when failure is detected.