To provide gain close to ideal ground at the time of using the ground of an antenna also as a shield part by providing a ground pattern on a position separated from the shield part for covering a high frequency processing part inside a main body and connecting it to the shield part.

A ground pattern is connected to a connection piece 41 for constituting a contact part provided on the shield part 40 and is composed of a conductive member such as a copper foil tape or the like connected to the connection piece 41 and joined to a rear part. The ground pattern 60 is formed stepwise along the rear part. Since the connection piece 41 is electrically joined to a first shield part 40a and connected to the ground pattern 60, the shield part 40 and the ground pattern 60 are turned to the same potential. Thus, the same effect is obtained as the one for which the ground area of the shield part 40 is enlarged. In such a manner, by providing the ground pattern 60 on the position separated from the shield part 40 for covering the high frequency processing part and connecting it to the shield part 40 inside the main body, the gain close to the ideal ground is obtained at the time of using the ground of the antenna 7 also as the shield part 40.