A solid electrolytic capacitor that includes: a capacitor element having a valve action metal base with a core portion, a first porous portion and a second porous portion, a first dielectric layer on the first porous portion, a first solid electrolyte layer on the first dielectric layer, a first conductor layer on the first solid electrolyte layer, a second dielectric layer on the second porous portion, and a second solid electrolyte layer on the second dielectric layer, the first dielectric layer and the first solid electrolyte layer constituting a first capacitance portion, and the second dielectric layer and the second solid electrolyte layer constituting a second capacitance portion; a cathode through electrode electrically connecting the first capacitance portion to a cathode external electrode; and a connection portion connecting the second capacitance portion to the first capacitance portion.