Antenna unit having a shield cover with no gap between four side wall portions and four corner portions

摘要

Mounted on a back surface ( 21 b) of a circuit board ( 21 ), a shield cover ( 24 ) has a substantially rectangular ceiling portion ( 241 ) with four corners which are chamfered, four side wall portions ( 242 - 245 ), and four corner portions ( 457 ). The shield cover ( 24 ) is mounted on the back surface ( 21 b) of the circuit board by soldering at the four corner portions ( 247 ). There is no gap between the four side wall portions ( 242 - 245 ) and the four corner portions ( 247 ). The shield cover ( 24 ) is formed by bending working of a metal plate ( 40 ) and has extension portions ( 248 ) at both ends of the four corner portions ( 247 ) so as to interpose with the side wall portions ( 242 - 245 ).