A method of manufacturing a solid electrolytic capacitor element which is provided with, on a surface of an anode body, at least a dielectric layer, a solid electrolyte layer, a carbon layer, and a conductive layer, characterized in that the method includes: a step of forming the carbon layer using a carbon paste containing a hydroxyl group-containing first binder resin; and a step of forming, on the carbon layer, the conductive layer using a conductive paste containing a hydroxyl group-containing second binder resin, wherein the amount of hydroxyl groups in the first and second binder resin is each 2 to 10 % by weight with reference to the total amount of the corresponding resin; wherein the carbon paste and the conductive paste are used in combination so that the difference Δγ h (= γ h 2 - γ h 1) between the hydrogen-bonding component value γ h 1 [mN/m] of the surface of the carbon layer and the hydrogen-bonding component value γ h 2 [mN/m] of the surface of the conductive layer is within the range of -3 ≤ Δγ h ≤ 3 [mN/m], wherein the hydrogen-bonding component values γ h 1 and γ h 2 are determined respectively for the surface of the carbon layer and the surface of the conductive layer by the Owens-Wendt method using water (γ L = 72.8 mN/m, γ d L = 21.8 mN/m, γ h L = 51.0 mN/m) and methylene iodide (γ L = 50.8 mN/m, γ d L = 49.5 mN/m, γ h 1 = 1.3 mN/m) as two liquids having a known surface energy γ L, dispersive component value γ d L, and hydrogen-bonding component value γ h L, wherein these values γ h 1 and γ h 2 are determined as the hydrogen-bonding component values of solid surface γ h s in the following Equation by dripping the two liquids onto the surface of each of the carbon layer and the conductive layer; measuring the contact angles θ for the two liquids on each surface, using a goniometer-type contact angle measuring device; and solving the simultaneous equations obtained for each surface from the Equation by substituting each of the measured contact angles θ together with the known surface energy γ L, dispersive component value γ d L, and hydrogen-bonding component value γ h L of each of the two liquid into the Equation, and γ d S in the Equation is the dispersive component value γ d S of solid surface. γ L ⋅ 1 + cos θ = 2 γ d L ⋅ γ d S 1 / 2 + 2 γ h L ⋅ γ h S 1 / 2 a step of forming the carbon layer using a carbon paste containing a hydroxyl group-containing first binder resin; and a step of forming, on the carbon layer, the conductive layer using a conductive paste containing a hydroxyl group-containing second binder resin, wherein the amount of hydroxyl groups in the first and second binder resin is each 2 to 10 % by weight with reference to the total amount of the corresponding resin; wherein the carbon paste and the conductive paste are used in combination so that the difference Δγ h (= γ h 2 - γ h 1) between the hydrogen-bonding component value γ h 1 [mN/m] of the surface of the carbon layer and the hydrogen-bonding component value γ h 2 [mN/m] of the surface of the conductive layer is within the range of -3 ≤ Δγ h ≤ 3 [mN/m], wherein the hydrogen-bonding component values γ h 1 and γ h 2 are determined respectively for the surface of the carbon layer and the surface of the conductive layer by the Owens-Wendt method using water (γ L = 72.8 mN/m, γ d L = 21.8 mN/m, γ h L = 51.0 mN/m) and methylene iodide (γ L = 50.8 mN/m, γ d L = 49.5 mN/m, γ h 1 = 1.3 mN/m) as two liquids having a known surface energy γ L, dispersive component value γ d L, and hydrogen-bonding component value γ h L, wherein these values γ h 1 and γ h 2 are determined as the hydrogen-bonding component values of solid surface γ h s in the following Equation by dripping the two liquids onto the surface of each of the carbon layer and the conductive layer; measuring the contact angles θ for the two liquids on each surface, using a goniometer-type contact angle measuring device; and solving the simultaneous equations obtained for each surface from the Equation by substituting each of the measured contact angles θ together with the known surface energy γ L, dispersive component value γ d L, and hydrogen-bonding component value γ h L of each of the two liquid into the Equation, and γ d S in the Equation is the dispersive component value γ d S of solid surface. γ L ⋅ 1 + cos θ = 2 γ d L ⋅ γ d S 1 / 2 + 2 γ h L ⋅ γ h S 1 / 2