A door threshold may include upper and lower members for sandwiching carpet andor carpet padding therebetween. An optical signal modulated by a signal component and that modulated by a distortion component are transmitted from the wireless key base station to the optical forward base station. Further, the area of a cross section perpendicular to the direction of flow of the fluid is gradually increased from the connecting part in the fluid transfer flow passage toward the outlet part. To be able to introduce the pump into the body by puncturing the blood vessel according to the Seldinger technique, the cannula is set into the constricted state in which it has a small diameter. The heat conduction part is formed of the same conductive materials as the connection hole and the metal wiring layer and extends toward an upper layer side along a path different from a wiring path including a connection hole and a metal wiring for signal transmission.