NOVELTY - A solid electrolytic capacitor comprises anode body (11); dielectric oxide layer (12); solid electrolyte layer (13); carbon layer (14A), containing carbon particles, and one of first and second additive, formed on electrolyte layer; conductor layer (14B); anode terminal (16); and a cathode terminal (18) connected to conductor layer. The first additive is formed from hydrated silica or silicate, and second additive is formed from condensation product of aromatic sulfonic acid with formaldehyde, aromatic sulfonate with formaldehyde, polystyrene sulfonic acid, or polystyrene sulfonate.    USE - As solid electrolytic capacitor (claimed) useful for various electronic equipment.    ADVANTAGE - The solid electrolytic capacitor has less in successive change of ESR (equivalent series resistance) even in a high temperature environment. Using the the carbon layer containing the first additive or the second additive, the adhesion of the carbon layer to the solid electrolyte layer can be maintained even in a high temperature environment. Accordingly, peeling of the carbon layer can be suppressed. As a result, it is possible to prevent the interfacial resistance from increasing between the solid electrolyte layer and the carbon layer. Also, it is possible to suppress the intrusion of external oxygen or water and to prevent increasing of the specific resistance of the solid electrolyte layer itself. Accordingly, the solid electrolyte capacitor is less in successive change of ESR. The capacitor containing first or second additive, and aromatic compound exhibits excellent in initial characteristics of electrostatic capacity (C) and ESR as compared with sample containing neither first or second additive, and aromatic compound.    DETAILED DESCRIPTION - A solid electrolytic capacitor comprises an anode body (11) made of a valve metal; a dielectric oxide layer (12) formed on the anode body; a solid electrolyte layer (13) formed on the dielectric oxide layer; a carbon layer (A1) (14A), containing carbon particles, and one of a first additive and a second additive, formed on the solid electrolyte layer, where the first additive is formed from at least one of hydrated silica or silicate, and the second additive is formed from at least one of a condensation product of an aromatic sulfonic acid with formaldehyde, a condensation product of an aromatic sulfonate with formaldehyde, polystyrene sulfonic acid, and polystyrene sulfonate; a conductor layer (14B) formed on the carbon layer; an anode terminal (16) connected to the anode body; and a cathode terminal (18) connected to the conductor layer. An INDEPENDENT CLAIM is included for manufacturing a solid electrolytic capacitor, involving forming a dielectric oxide layer on an anode body made of a valve metal; forming a solid electrolyte layer on the dielectric oxide layer; forming a carbon layer (A1) on the solid electrolyte layer; forming a conductor layer on the carbon layer; connecting an anode terminal to the anode body; and connecting a cathode terminal to the conductor layer.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the solid electrolyte capacitor.    anode body (11)    dielectric oxide layer (12)    solid electrolyte layer (13)    carbon layer (14A)    conductor layer (14B)    anode terminal (16)    cathode terminal. (18)