PURPOSE: To obtain a composition useful as an electrolyte for electrolytic capaci tor, which has a low resistance and has superior impedance characteristics, by a method wherein a component obtained by neutralizing an organic acid with guanidine or its derivative is used as a solvent for the electrolyte.

CONSTITUTION: A high-conductivity composition for electrolyte is one obtained by dissolving an organic carboxylic acid and quanidine or salt consisting of its derivative in a solvent for electrolyte, it is desirable to react a component (a) and a component (b) of this composition with each other at a rate of 0.4 to 1.6 (more desirably, 0.5 to 1.0) in the molar ratio of the component (a) to the component (b). As the solvent to dissolve such the salt, a solvent having a low freezing point and a high boiling point is desirable, it is desirable that the salt is dissolved in the solvent in a rate of about 10 to 40wt.% (more desirably, 15 to 30wt.%). Thereby, the composition for electrolyte is never generated water at the time of neutralization, the generation of mooted problems due to the water can be prevented and problems, such as the deterioration of characteristics to be required as a capacitor, a change of the capacitor with time and a shortening of the life of the capacitor, are not generated.