A first plate member constitutes a part of a main frame of a liquid ejection
apparatus.
A second plate member is extended from the first plate member such that a first
part thereof opposes to a traveling path of a carriage which carries a plurality
of liquid containers each provided with an IC chip and a receiving antenna. A transmission
antenna is provided on an antenna board. The antenna board is mounted on the first
part of the second plate member. The second plate member is formed with a first
region which allows the transmission antenna to establish radio communication with
the receiving antenna, and a second region which shields radio waves.
