SOLID ELECTROLYTIC CAPACITOR

PROBLEM TO BE SOLVED: To provide a solid electrolytic capacitor which is arranged so as to suppress the infiltration of moisture from the outside, and which is superior in reliability.SOLUTION: A solid electrolytic capacitor 100 comprises: a capacitor element CU having a positive electrode 1 composed of a piece of Al foil having a core part 1A and a porous part 1B, a dielectric layer composed of an Al oxide film on the surface of the porous part 1B, and a negative electrode 2 including a solid electrolyte layer 2A; a substrate 4 including a base 4A and a lead conductor 4B; an exterior packaging part 6 sealing the capacitor element CU on the substrate 4 so that an end of the positive electrode 1 and an end of the lead conductor 4B are exposed with the negative electrode 2 connected with the lead conductor 4B; and a first external electrode 7 formed on a surface of the exterior packaging part 6, and connected with the lead conductor 4B, and a second external electrode 8 connected with the end of the positive electrode 1. The thickness of the porous part 1Bat the end of the positive electrode 1 exposed from the exterior packaging part 6 is thinner than the thickness of the porous part 1Bin a region where the negative electrode is formed.SELECTED DRAWING: Figure 1 【課題】外部からの水分の浸入が抑制され、信頼性に優れた固体電解コンデンサを提供する。【解決手段】固体電解コンデンサ１００は、芯部１Ａおよび多孔質部１Ｂを有するＡｌ箔である陽極１と、多孔質部１Ｂの表面のＡｌ酸化物膜である誘電体層と、固体電解質層２Ａを含む陰極２とを備えたコンデンサ素子ＣＵと、基体４Ａおよび引き出し導体４Ｂを含む基板４と、陰極２と引き出し導体４Ｂとが接続された状態で、陽極１の端部および引き出し導体４Ｂの端部が露出するように、基板４上にコンデンサ素子ＣＵを封止する外装部６と、外装部６の表面に形成され、引き出し導体４Ｂと接続された第１の外部電極７および陽極１の端部と接続された第２の外部電極８とを備える。外装部６から露出している陽極１の端部における多孔質部１Ｂ2の厚みは、陰極の形成されている領域における多孔質部１Ｂ1の厚みより薄い。【選択図】図１