A lead storage battery comprising: a battery case comprising a cell chamber; a polar plate group 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; the negative electrode ear portion comprises a surface layer comprising Sn in an amount of 50 parts by mass or more, based on 100 parts by mass of the surface layer; when a total surface area of the positive electrode material filled portion and the negative electrode material filled portion is represented by S1 and an apparent total volume of the positive electrode material filled portion and the negative electrode material filled portion is represented by VI, S1/V1 is 8.9 cm -1 or larger, the total surface area S1 is expressed by the following expression (a): total surface area S 1 = filled portion width W 1 × filled portion height H 1 × 2 × number N 1 of electrodes wherein W1 is the width of the electrode material filled portion, H1 is the height of the electrode material filled portion, and N1 is the number of electrodes in the polar plate group, and the apparent total volume V1 is expressed by the following expression (b): apparent total volume V 1 = filled portion width W 1 × filled portion height H 1 × thickness D 1 of polar plate group wherein W1 and H1 are as defined above, and D1 is the thickness of the polar plate group. a battery case comprising a cell chamber; a polar plate group 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; the negative electrode ear portion comprises a surface layer comprising Sn in an amount of 50 parts by mass or more, based on 100 parts by mass of the surface layer; when a total surface area of the positive electrode material filled portion and the negative electrode material filled portion is represented by S1 and an apparent total volume of the positive electrode material filled portion and the negative electrode material filled portion is represented by VI, S1/V1 is 8.9 cm -1 or larger, the total surface area S1 is expressed by the following expression (a): total surface area S 1 = filled portion width W 1 × filled portion height H 1 × 2 × number N 1 of electrodes wherein W1 is the width of the electrode material filled portion, H1 is the height of the electrode material filled portion, and N1 is the number of electrodes in the polar plate group, and the apparent total volume V1 is expressed by the following expression (b): apparent total volume V 1 = filled portion width W 1 × filled portion height H 1 × thickness D 1 of polar plate group wherein W1 and H1 are as defined above, and D1 is the thickness of the polar plate group.