An automatic parking lot management system includes an infrastructure sensor for detecting a preset range in a parking lot. A mobile body including a peripheral detection sensor is used, and the mobile body is able to be moved to a detectable position at which the peripheral detection sensor of the mobile body is able to detect a detection range of the infrastructure sensor. When determination is made that there is an abnormality in the infrastructure sensor, the mobile body is moved to the detectable position to cause the peripheral detection sensor to detect the detection range of the infrastructure sensor.