An inner magnet type microspeaker including a suspension is provided which can maximize the size of a magnet. The secondary battery includes a battery unit formed by rolling a stack of a negative plate, a separator, and a positive plate, a cap assembly, and an electrode tab drawn out from one of the negative plate and the positive plate and electrically connected to an electrode port from the cap assembly. Spacers having a Young’s modulus of less than 2 GPa are mounted on both end sides of the second piezoelectric vibrating plate to prevent contact between the vibrating plates, thus preventing damage. The opening is of sufficient size to allow the articles to be individually removed. The inspection system of the present invention includes a socket of the present invention, and an evaluation board for connecting a third terminal of the socket electrically to the inspection apparatus of the electronic component, and propagating an inspection signal. Since the insert is positioned before molding takes place, the insert does not cause the formed panels to rest and cool down before fusing is finally carried out to capture the insert and seal the panels to each other.