An LED module substrate includes a substrate main body, an LED mounted on one plane of the substrate main body, and a contact mounted at an edge of the one plane of the substrate main body and electrically connected to the LED. A cover section covers the LED module substrate in which the contact and the thermal radiation sheet are exposed. A lamp is attached to a socket. The socket includes a terminal electrically connected to the contact by the attachment of the lamp. A luminaire main body includes a thermal radiator including a contact surface and a recess. The lamp attached to the socket is brought into contact with and thermally connected to the contact surface. The recess is provided in a position opposed to the terminal of the socket.