A method of making an electrochemical capacitor electrode comprising a collector and an electronically conductive porous layer formed on the collector while in electric contact therewith, the porous layer containing at least an electronically conductive porous particle and a binder adapted to bind the porous particle;
- the method comprising:
- an absorbing step of causing the porous particle to absorb an organic solvent usable in a nonaqueous electrolytic solution so as to yield a porous particle with a solvent including the organic solvent existing on a surface of the porous particle before a mixing step of mixing the porous particle and the binder.