Provided is an electrolysis solution for an electrolytic capacitor, having high spark voltage and excellent electric conductivity and heat resistance to spark voltage, and an electrolytic capacitor using the electrolysis solution. An electrolysis solution for an electrolytic capacitor including at least a silicone-based surfactant, colloidal silica, an electrolyte salt, and an organic solvent, and an electrolytic capacitor using the electrolysis solution. Containing the silicone-based surfactant makes it possible to prevent charge balance of the colloidal silica from being lost.