A positive electrode grid body for lead-acid battery, comprising: a frame rib shaped in a rectangular frame comprising a first lateral frame rib located on an upper end and extending in a lateral direction, a second lateral frame rib located on a lower end and extending in the lateral direction, a first longitudinal frame rib located on a left end and extending in a longitudinal direction, and a second longitudinal frame rib located on a right end and extending in the longitudinal direction, when the positive electrode grid body is viewed in planar view; an inner rib disposed in the frame rib and comprising a plurality of lateral crosspieces and longitudinal crosspieces which are connected to the frame rib to form a grid; a plurality of opening portions defined by a region surrounded by the frame rib and the plurality of lateral crosspieces and longitudinal crosspieces, and a region surrounded by the plurality of lateral crosspieces and longitudinal crosspieces; and a positive electrode current collection lug connected to the first lateral frame rib and located on the second longitudinal frame rib side, wherein in a region having a length of at least one opening portion or more in the lateral direction of the lateral crosspieces from the first longitudinal frame rib, a cross-sectional area of the plurality of lateral crosspieces located on at least the first lateral frame rib side becomes larger from the second longitudinal frame rib side toward a portion connected to the first longitudinal frame rib, an average area of the plurality of opening portions adjacent to the first longitudinal frame rib and the plurality of opening portions adjacent to the second longitudinal frame rib in planar view is smaller than an average area of a remaining plurality of opening portions excluding the plurality of opening portions, and an area of the plurality of the opening portions in planar view adjacent to the first longitudinal frame rib becomes smaller stepwise from the second lateral frame rib side toward the first lateral frame rib side, and an area of the plurality of the opening portions in planar view adjacent to the second longitudinal frame rib becomes smaller stepwise from the second lateral frame rib side toward the first lateral frame rib side. a frame rib shaped in a rectangular frame comprising a first lateral frame rib located on an upper end and extending in a lateral direction, a second lateral frame rib located on a lower end and extending in the lateral direction, a first longitudinal frame rib located on a left end and extending in a longitudinal direction, and a second longitudinal frame rib located on a right end and extending in the longitudinal direction, when the positive electrode grid body is viewed in planar view; an inner rib disposed in the frame rib and comprising a plurality of lateral crosspieces and longitudinal crosspieces which are connected to the frame rib to form a grid; a plurality of opening portions defined by a region surrounded by the frame rib and the plurality of lateral crosspieces and longitudinal crosspieces, and a region surrounded by the plurality of lateral crosspieces and longitudinal crosspieces; and a positive electrode current collection lug connected to the first lateral frame rib and located on the second longitudinal frame rib side, wherein in a region having a length of at least one opening portion or more in the lateral direction of the lateral crosspieces from the first longitudinal frame rib, a cross-sectional area of the plurality of lateral crosspieces located on at least the first lateral frame rib side becomes larger from the second longitudinal frame rib side toward a portion connected to the first longitudinal frame rib, an average area of the plurality of opening portions adjacent to the first longitudinal frame rib and the plurality of opening portions adjacent to the second longitudinal frame rib in planar view is smaller than an average area of a remaining plurality of opening portions excluding the plurality of opening portions, and an area of the plurality of the opening portions in planar view adjacent to the first longitudinal frame rib becomes smaller stepwise from the second lateral frame rib side toward the first lateral frame rib side, and an area of the plurality of the opening portions in planar view adjacent to the second longitudinal frame rib becomes smaller stepwise from the second lateral frame rib side toward the first lateral frame rib side.