Abstract: To provide a parking lot management system capable of maintaining a high vehicle number recognition rate even with reduced camera performance. A parking lot management system 1 comprises a parking lot system 10 installed in a parking lot, and a server device 30 connected thereto by a network 2. The parking lot system 10 comprises a camera unit 11, and the server device 30 comprises a server-side control means 31, server-side memory 32, a data analysis means 33, and a server-side communication means 34. The camera unit 11 comprises a camera-side control means 13, a flashlight 14, an indicator 15 for indicating that a space is occupied, a camera 16, camera-side memory 17, and a camera-side communication means 18. Because the data analysis means 33 of the server device 30 has high analytical power, a low-performance camera 16 is sufficient for the camera unit 11.