A packaging material excellent in moldability, colorability, and strength is provided. The packaging material includes a substrate layer made of a heat-resistant resin, a metal foil layer laminated on an inner side of the substrate layer, a sealant layer m...

A flexible housing (3) of electrochemical element comprises two metal sheets (5) which are connected and sealed to one another and positioned directly adjacent to an electrode. A plastic layer is provided on an outer portion of the metal sheets.