A lead-acid battery grid (140, 140A, 140B, 140C, 140D, 140E), comprising: a quadrangular frame including a first frame rib with a length F1 that extends in a first direction and a second frame rib with a length F2 that extends in a second direction intersecting the first direction and is connected with the first frame rib at a first vertex; and an inner part disposed on an inner peripheral side of the frame, and including a plurality of first inner ribs that extend toward the first frame rib, and a plurality second inner ribs that extend toward the second frame rib, wherein L1 is the number of first inner ribs (L1 is an integer of 2 or more), extending toward a first vertex-side portion of the first frame rib among the first frame ribs, that is a portion from a position of the first vertex to a position separated by a first reference length being shorter than both a half of the length F1 and a half of the length F2, the first inner ribs extending over at least three of the second inner ribs, M1 is the number of first inner ribs (M1 is an integer of 1 or more), being located between a specific second inner rib that is closest to the first frame rib among the at least three of the second inner ribs and the first vertex-side portion of the first frame rib, and being connected to both the specific second inner rib and the first vertex-side portion of the first frame rib, P1 is the number of second inner ribs (P1 is an integer of 2 or more), extending toward a first vertex-side portion of the second frame rib among the second frame ribs, that is a portion from a position of the first vertex to a position separated by the first reference length, and extending over at least three of the first inner ribs, Q1 is the number of second inner ribs (Q1 is an integer of 1 or more and smaller than P1), being located between a specific first inner rib that is closest to the second frame rib among the at least three of the first inner ribs and the first vertex-side portion of the second frame rib, and being connected to both the specific first inner rib and the first vertex-side portion of the second frame rib, and a relational expression shown in below holds. M1 / L 1 > Q 1 / P 1 a quadrangular frame including a first frame rib with a length F1 that extends in a first direction and a second frame rib with a length F2 that extends in a second direction intersecting the first direction and is connected with the first frame rib at a first vertex; and an inner part disposed on an inner peripheral side of the frame, and including a plurality of first inner ribs that extend toward the first frame rib, and a plurality second inner ribs that extend toward the second frame rib, wherein L1 is the number of first inner ribs (L1 is an integer of 2 or more), extending toward a first vertex-side portion of the first frame rib among the first frame ribs, that is a portion from a position of the first vertex to a position separated by a first reference length being shorter than both a half of the length F1 and a half of the length F2, the first inner ribs extending over at least three of the second inner ribs, M1 is the number of first inner ribs (M1 is an integer of 1 or more), being located between a specific second inner rib that is closest to the first frame rib among the at least three of the second inner ribs and the first vertex-side portion of the first frame rib, and being connected to both the specific second inner rib and the first vertex-side portion of the first frame rib, P1 is the number of second inner ribs (P1 is an integer of 2 or more), extending toward a first vertex-side portion of the second frame rib among the second frame ribs, that is a portion from a position of the first vertex to a position separated by the first reference length, and extending over at least three of the first inner ribs, Q1 is the number of second inner ribs (Q1 is an integer of 1 or more and smaller than P1), being located between a specific first inner rib that is closest to the second frame rib among the at least three of the first inner ribs and the first vertex-side portion of the second frame rib, and being connected to both the specific first inner rib and the first vertex-side portion of the second frame rib, and a relational expression shown in below holds. M1 / L 1 > Q 1 / P 1