A semiconductor integrated circuit includes a plurality of memory cells arranged in a cell-placement row extending in a first direction, a first N well and a first P well arranged in a second direction perpendicular to the first direction in each area of the memory cells, and a second N well and a second P well each having the same length as a width of the cell-placement row and situated between at least two adjacent memory cells of the plurality of memory cells, wherein the first N well and the second N well are integrated, and the first P well and the second P well are integrated.