To expand, add, or select characteristics by providing a connection means for connecting a sub capacitor or other parts to a main capacitor for obtaining specific characteristics.

A main capacitor 1 is a large-capacity capacitor such as a square-type surface-mount tantalum solid electrolytic capacitor with a main capacitor electrode 1a that becomes the terminal of a thick-film conductor at both ends at the nucleus of the capacitor. Also, the main capacitor 1 is joined to a sub capacitor 2 such as a square-type surface-mount lamination ceramic capacitor (capacitor) with a sub capacitor electrode 2a at both ends. Then, the main capacitor 1 is provided with a connection means 3 for soldering or engaging the sub capacitor 2 to the surface of the main capacitor 1 by forming a thick-film conductor, a thin-film conductor, or a metal plate conductor. Also, the sub capacitor 2 is a capacitor with a small capacity with a terminal for joining to the main capacitor 1 at both ends and has smaller external dimensions than the main capacitor 1.