[Object] To provide a signal transmission system capable of ascertaining positions or the like of mounting targets with more versatile and simpler configurations.[Solution] A signal transmission device including: a power generation unit configured to generate power in accordance with a surrounding environment； a first communication unit configured to send a signal using the power generated by the power generation unit； a storage unit configured to store communication control information for controlling the first communication unit； a communication control unit configured to control the first communication unit on a basis of the communication control information； and a contactless communication unit configured to receive rewrite information for rewriting the communication control information stored in the storage unit by contactless communication.
