To produce activated carbon for an electrode of an electric double-layer
capacitor, the following steps are carried out sequentially: a step of
subjecting a massive mesophase pitch to a pulverizing treatment to
provide a pulverized powder; a step of subjecting the pulverized powder
to an infusibilizing treatment under conditions of a temperature in a
range of 300.degree. C. (inclusive) to 450.degree. C. (inclusive) in the
atmospheric air current, a step of subjecting the pulverized powder to a
carbonizing treatment under conditions of a temperature in a range of
600.degree. C. (inclusive) to 900.degree. C. (inclusive) in an inert gas
current to provide a carbonized powder, a step of subjecting the
carbonized powder to an alkali activating treatment under conditions of a
temperature in a range of 500.degree. C. (inclusive) to 1,000.degree. C.
(inclusive) in an inert gas atmosphere, followed by the post treatments,
thereby producing alkali-activated carbon, and a step of subjecting the
alkali-activated carbon to a pulverizing treatment. If an electrode is
produced using the activated carbon, the electrode density can be
increased.