In an electrical double-layer capacitor having a pair of polarizable
electrodes, a separator between the polarizable electrodes and a liquid
electrolyte, the polarizable electrodes contain as a main component an
activated carbon having micropores with a pore radius distribution peak
as determined by the MP method within a range of 4.0.times.10.sup.-10 to
8.0.times.10.sup.-10 m, and the liquid electrolyte includes an
electrolyte salt which is an ionic liquid. Such electrical double-layer
capacitors have excellent low-temperature characteristics and a high
electrostatic capacitance.