A solid electrolytic capacitor comprises a positive electrode, a dielectric layer, a silane coupling layer, a conductive polymer layer, and a negative electrode layer. The dielectric layer is provided on the positive electrode. The silane coupling layer is provided on the dielectric layer. The conductive polymer layer is provided on the silane coupling layer. The negative electrode layer is provided on the conductive polymer layer. The silane coupling layer comprises a first silane coupling layer and a second silane coupling layer. The first silane coupling layer covers a part of a surface of the dielectric layer facing the conductive polymer layer. The second silane coupling layer covers at least a part of a portion exposed from the first silane coupling layer on the surface of the dielectric layer facing the conductive polymer layer.