PURPOSE: To equalize the impregnation of the an insulating oil of capacitor elements even if the capacitor element assemblies comprising the collected capacitor elements are laterally laminated.

CONSTITUTION: Plural capacitor elements in respective blocks 1 comprising the capacitor element assemblies are divided into plural blocks so as to be held between the fixing shelves 2 jointly provided in the vertical direction. Since the capacitor elements 1 in respective blocks are mounted on the fixing shelves 2, the upper capacitor elements 1 are not loaded upon the lower capacitor elements 1. Accordingly, the capacitor elements in respective blocks are not pressed exceeding the required degree thereby enabling the impregnation of an insulating oil to be equalized.