A safety check system of the invention is equipped with a safety detection device attached to a body of a checked person, a server for accumulating various pieces of information, and a terminal of a checker for executing a safety check of the checked person, wherein the detection device is equipped with a first radio communication mechanism for making a radio communication with the server, a vital signal detection mechanism for detecting a vital signal of the checked person, and a first control mechanism for creating safety information of the checked person; and the server is equipped with a second radio communication mechanism for making a radio communication with the detection device, a detection history memory mechanism for memorizing a detection history of the checked person, and a second control mechanism for sending the detection history of the checked person in the detection history memory mechanism to the terminal.