To provide a carbonaceous material for electric double layer capacitor, carbonaceous material which demonstrates a good charge/discharge characteristic, when it makes an electric double layer capacitor. A carbonaceous material according to the present invention for electric double layer capacitor is used as a polarizable active material in electric double layer capacitor, and is characterized in that , when measuring it by an electron spin resonance method without adding any additive thereto, the obtained peak line width is 2 mT or less, and in that the peak intensity, which is converted into a number of unpaired electron per 1 g, is 1 &dlowbar; 10 19 or more. Since the carbonaceous material according to the present invention for electric double layer capacitor has turned into a carbonaceous material from which residual functional groups are removed, the reactions between the residual functional groups and the electrolytic liquid are suppressed when forming a capacitor, and thereby a capacitor, which is good in terms of the charge/discharge characteristic, is obtainable.