A male connector includes a male body and a male conductor. The male body includes an outer face including a first curved surface and a housing space on an inner side of the first curved surface of the male body. The male conductor is provided inside the housing space and includes a functional part. The functional part is a male communication antenna, a male power-transmission antenna, or a male power-reception antenna. A female connector includes a female body and a female conductor. The female body includes a connection hole, an inner wall surface of the connection hole, the inner wall surface including a first curved surface, a housing space on an outer side of the first curved surface of the connection hole of the female body. The female conductor is provided inside the housing space and includes a functional part. The functional part is a female communication antenna, a female power-reception antenna, or a female power-transmission antenna.