In this invention, a capacitor element comprises an anode body, a dielectric layer formed on the surface of the anode body, a solid electrolyte layer that covers at least a portion of the dielectric layer, and a cathode lead-out layer that covers at least a portion of the solid electrolyte layer; the solid electrolyte layer containing an electrically conductive polymer and a dopant; the dopant containing a compound that has a benzene skeleton and at least one sulfo group bonded to the benzene skeleton; and sulfate ions contained in the solid electrolyte layer being present in an amount of 1 mass% or less. Also provided is an electrolytic capacitor in which any decline in performance under high temperature and high humidity is minimized through the use of the capacitor element and the electrolytic capacitor.