The invention provides a current condenser. One end of a tubular casing of the current condenser is provided with a sealed opening part, and elements are accommodated in the tubular casing. The current condenser can be kept insulated at an insulating tube part of an electrolytic capacitor even if an insulating tube is damaged with pin holes and the like. According to the current condenser provided by the invention, the lateral outer surface of the casing is laminated with two layers of insulating tubes.