Antenna device

摘要

An antenna device is attached to an outer face of a plate member having a through hole connecting the outer face and inner face of the plate member. A cover defines a space for covering an antenna element. A tubular projection extends from the cover so as to communicate with the space and has a first locking member. The projection is inserted into the through hole from the outside to the inside of the plate member in a first direction. A cap member has a second locking member and is adapted to be fitted with the projection from the inside of the plate member such that the second locking member is engaged with the first locking member to lock the cap member in contact with the inner face of the plate member.