The second embodiment is based on the configuration of the first embodiment, and furthermore, a plurality of recesses 36 are arranged, in addition to a recess 32, on a surface of {HEAD ~ an antenna structure support} 27 which faces {TAIL ~ a wall} 7 a of an attachment portion 7 as shown in FIG 9 
faces
The second embodiment is based on the configuration of the first embodiment , and furthermore , a plurality of recesses 36 are arranged , in addition to a recess 32 , on a surface of { HEAD ~ an antenna structure support } 27 which faces { TAIL ~ a wall } 7 a of an attachment portion 7 as shown in FIG 9
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