To facilitate assembly with a simple configuration by providing a display circuit that is electrically connected to mount and a helical antenna which is electrically connected to the mount and electrically connects the mount to a linear antenna by energising the mount.

One part (upper part) of a helical antenna 201 is brought into contact by pressing with the inner wall of a case 101, the other (lower part) also comes into contact with mount 206, and the mount 206 is energized downward by the spring function of the helical antenna 201, is brought into contact with and is electrically connected to a linear antenna 103 by such a manner that pressure is applied. Thus, the helical antenna 201 and a display circuit provided in a printed wiring board 202 are connected to a linear antenna 100 through the mount 206. A lower part 108 is attached to the linear antenna 100 by screwing screws 207 and 208 and then, the printed wiring board 202 to which a LED 205, etc., is soldered and the mount 206 provided integrally with it are mounted inside the lower part 108.