[Problem] To provide a signal transmission device and a management system in which a signal including information on an attachment target or information on the surrounding of an attachment target can be transmitted without including a power supply. [Solution] This management system comprises: a signal transmission device including a housing that is attached to a management target by being oriented in a predetermined direction, a first optical power generation unit and a second optical power generation unit respectively including a light receiving unit on a first surface and a second surface which face outward in the predetermined direction, a first temperature sensor and a second temperature sensor respectively including a thermal contact point on the first surface and the second surface, and a communication control unit that transmits, by using the power generated by the first optical power generation unit and/or the second optical power generation unit, a signal including temperature information detected by the first temperature sensor and the second temperature sensor； and an information processing device including a control unit that receives the signal transmitted from the signal transmission device and that outputs status information of the management target to which the signal transmission device is attached on the basis of at least the temperature information detected by the first temperature sensor and the second temperature sensor.Le problème décrit par la présente invention est de fournir un dispositif de transmission de signal et un système de gestion dans lesquels un signal comprenant des informations sur une cible de fixation ou des informations sur l'environnement où se trouve une cible de fixation peut être transmis sans alimentation électrique. La solution selon l'invention porte sur un système de gestion comprenant : un dispositif de transmission de signal comprenant un boîtier qui est fixé à une cible de gestion en étant orienté dans une direction
