A vital data collection system is for collecting vital data of an actor acting in an environment not reached or not easily reached by radio waves from a mobile phone base station. The vital data collection system includes a sensor, a relay device, and a collection server. The sensor is carried by the actor and measures vital data of the actor. The relay device is carried by the actor, acquires the vital data of the actor measured by the sensor, and transmits the acquired vital data by low-power long-range wireless communication. The collection server collects, via a network, the vital data transmitted from the relay device.
