LEAD-ACID BATTERY AND METHOD OF MANUFACTURING LID MEMBER OF LEAD-ACID BATTERY

Provided is a lead-acid battery which includes: an element; an electrolyte solution; a container housing the element and the electrolyte solution; and a lid member sealing the container, wherein the lid member includes: a middle lid covering the container; an upper lid welded to an upper portion of the middle lid in an overlapping manner; and an exhaust passage arranged between the middle lid and the upper lid, through which an inside of the container is communicated with an outside, wherein a bottom surface of the exhaust passage is inclined such that the solution in the passage returns into the container, and the upper lids include: a passage wall welded to the middle lid and forming a side wall of the exhaust passage; and a transverse wall formed on a ceiling surface of the exhaust passage and traversing the exhaust passage, and a lower end portion of the transverse wall is positioned above a welded portion between the passage wall and the middle lid.