In a terminal connection structure, a stud bolt is stood and inserted into a hole of a top plate portion of a terminal, and the nut is screwed and fastened to the stud bolt on the top plate, thus connecting the terminal to the stud bolt. In order to realize inter-cell cooperative transmissionreception, a CSI-RS which is used for estimating the state of a spatial propagation path of a communication line is generated by a CSI-RS generation unit, and the CSI-RS is disposed in a predetermined subframe by a disposition unit and transmitted. The detector resin member includes a light incidence surface exposed from the light shield layer, and the emitter resin member includes a light output surface exposed from the light shield layer.