Cathode for capacitor and method for producing capacitor

A capacitor cathode including a cathode collector and a cathode mixture supported by the cathode collector, wherein the cathode collector has a 3D network shaped skeleton containing aluminum or an aluminum alloy, the cathode mixture contains at least a cathode active material and a binder, the cathode active material contains activated charcoal, the binder contains a polymer of which the melting point and/or the deflection temperature under load conforming to JIS K7191 is at least 250°C, and the moisture content is no greater than 500 ppm.