A lead storage battery comprising: a battery case comprising a cell chamber; an electrode plate group being provided in the cell chamber, and comprising a separator, a positive electrode plate and a negative electrode plate, the positive electrode plate and the negative electrode plate being alternately stacked with the separator disposed therebetween; and an electrolytic solution accommodated in the cell chamber, wherein the positive electrode plate comprises: a positive electrode material filled portion comprised of a positive electrode material; a positive electrode current collector supporting the positive electrode material filled portion; and a positive electrode ear portion provided on an upper peripheral portion of the current collector, the negative electrode plate comprises: a negative electrode material filled portion comprised of a negative electrode material; a negative electrode current collector supporting the negative electrode material filled portion; and a negative electrode ear portion provided on an upper peripheral portion of the current collector, p1/n1 is 1.35 or more, wherein p1 represents a mass of the positive electrode material and n1 represents a mass of the negative electrode material, and characterised in that S1/V1 is 8.9 cm -1 or more, wherein S1 represents a total surface area of the positive electrode material filled portion and the negative electrode material filled portion and V1 represents an apparent total volume of the positive electrode material filled portion and the negative electrode material filled portion, wherein S1 is represented by S 1 = W 1 × H 1 × 2 × N 1, and V1 is represented by V 1 = W 1 × H 1 × D 1, wherein W1 represents a width of the electrode material filled portion (24, 34), H1 represents a height of the electrode material filled portion (24, 34), N1 represents a number of the electrode plates (12, 13) in the electrode plate group, and D1 represents a thickness of the electrode plate group. a battery case comprising a cell chamber; an electrode plate group being provided in the cell chamber, and comprising a separator, a positive electrode plate and a negative electrode plate, the positive electrode plate and the negative electrode plate being alternately stacked with the separator disposed therebetween; and an electrolytic solution accommodated in the cell chamber, wherein the positive electrode plate comprises: a positive electrode material filled portion comprised of a positive electrode material; a positive electrode current collector supporting the positive electrode material filled portion; and a positive electrode ear portion provided on an upper peripheral portion of the current collector, a positive electrode material filled portion comprised of a positive electrode material; a positive electrode current collector supporting the positive electrode material filled portion; and a positive electrode ear portion provided on an upper peripheral portion of the current collector, the negative electrode plate comprises: a negative electrode material filled portion comprised of a negative electrode material; a negative electrode current collector supporting the negative electrode material filled portion; and a negative electrode ear portion provided on an upper peripheral portion of the current collector, a negative electrode material filled portion comprised of a negative electrode material; a negative electrode current collector supporting the negative electrode material filled portion; and a negative electrode ear portion provided on an upper peripheral portion of the current collector, p1/n1 is 1.35 or more, wherein p1 represents a mass of the positive electrode material and n1 represents a mass of the negative electrode material, and characterised in that S1/V1 is 8.9 cm -1 or more, wherein S1 represents a total surface area of the positive electrode material filled portion and the negative electrode material filled portion and V1 represents an apparent total volume of the positive electrode material filled portion and the negative electrode material filled portion, wherein S1 is represented by S 1 = W 1 × H 1 × 2 × N 1, and V1 is represented by V 1 = W 1 × H 1 × D 1, wherein W1 represents a width of the electrode material filled portion (24, 34), H1 represents a height of the electrode material filled portion (24, 34), N1 represents a number of the electrode plates (12, 13) in the electrode plate group, and D1 represents a thickness of the electrode plate group.