A loop antenna is formed on one side of a circuit board and an IC chip is mounted
on the same side of the circuit board. An inner end of the loop antenna is connected
to an antenna connection terminal of the IC chip. An arm part provided with a first
pad part, a second pad part, and a conducting wire for allowing conduction between
the fist pad part and the second pad part is collapsibly provided in such a manner
that, when the arm part is collapsed, an outer end of the loop antenna contacts
the first pad part and an antenna connection terminal of the IC chip contacts the
second pad part.
