To provide a resin erecting lens array and an image reading apparatus which can sufficiently eliminate stray light.

In a resin lens plate 1 having spherical or aspherical convex microlenses regularly arranged at a specified lens pitch on at least one surface of the sheet, arrangement of the convex microlenses 2 is controlled in such a manner that, when the convex microlenses 2 are alternately arranged into a hexagonal arrangement, the direction of a straight line connecting centers of the microlenses 2 does not coincide with the long-side direction of the lens array in a circular region having a length of twice the lens pitch as its radius and one convex microlens as its center.