To provide a control device not imposing inconvenience on people utilizing infrastructure. A control device of an infrastructure control system for controlling infrastructure, comprises: a collection section; a control instruction reception section; a control section; and a fault detection section. The collection section collects sensing data related to the infrastructure. The control instruction reception section receives a control instruction related to the sensing data from a server 18. The control section controls the infrastructure on the basis of the received control instruction. The fault detection section detects a fault of communication with the server. The control section controls the infrastructure on the basis of the sensing data related to the infrastructure when the fault is detected by the fault detection section, determines transition timing for returning control from control based on the sensing data related to the infrastructure to control based on the control instruction when restoration from the fault of the communication is detected, and continues the control based on the sensing data related to the infrastructure until the transition timing comes.