Patent ID: 7002523

Claim:
An antenna device attached on an outer face of a plate member having a through hole connecting the outer face and an inner face of the plate member, the electric device comprising: an antenna element; a cover, defining a space for covering the antenna element; a tubular projection, extended from the cover member so as to communicate with the space, the projection inserted into the through hole from the outside to the inside of the plate member in a first direction; and a washer, comprising: a semiannular body, elastically fitted on an outer periphery of the projection; and an elastic piece, elastically deformable in a second direction which is perpendicular to the first direction to allow the washer to pass through the through hole from the outside to the inside of the plate member together with projection, the elastic piece being brought into contact with the inner face when the washer is placed at the inside of the plate member.