The present invention discloses a solid electrolytic capacitor comprising an anode comprising a sintered porous body formed with a dielectric. The sintered porous body is formed of a valve metal powder having a charge / mass ratio of about 100,000 microfarads* volt / gram or more. A solid electrolyte covering the anode, and an intrinsic conductive polymer comprising a repeating unit havs the following formula (I), wherein R = (CH2)a-O-(CH2)b; a = 0-10, b = 1- 18; Z is a negative anion and X is a positive ion.