A vehicle stabilizer including eye portions on both ends, each of the eye portions comprising: a first flat surface and a second flat surface that are parallel to each other; a trim portion which is located at a distal end of the eye portion, and includes a distal end surface at right angle to the first flat surface and the second flat surface; a through-hole which includes an inner surface at right angle to the first flat surface and the second flat surface, and is open on the first flat surface and the second flat surface; and a flat annular reference surface which is a part of the first flat surface, and is formed around an opening of the through-hole, a distal-end-side curved portion which is formed at a first corner portion where the first flat surface intersects the distal end surface, on an outer side of the annular reference surface, a thickness of the distal-end-side curved portion being smaller than a thickness of the eye portions, the thickness of the distal-end-side curved portion becoming smaller from the first flat surface toward the distal end surface in a first length; and a hole-side curved portion which is formed at a second corner portion where the first flat surface intersects the inner surface of the through-hole all around the opening, on an inner side of the annular reference surface, characterized by a thickness of the hole-side curved portion being smaller than a thickness of the eye portions, the thickness of the hole-side curved portion becoming smaller from the first flat surface toward the inner surface in a length (H2, H3) less than the first length, the hole-side curved portion being curved with a curvature greater than that of the distal-end-side curved portion. a first flat surface and a second flat surface that are parallel to each other; a trim portion which is located at a distal end of the eye portion, and includes a distal end surface at right angle to the first flat surface and the second flat surface; a through-hole which includes an inner surface at right angle to the first flat surface and the second flat surface, and is open on the first flat surface and the second flat surface; and a flat annular reference surface which is a part of the first flat surface, and is formed around an opening of the through-hole, a distal-end-side curved portion which is formed at a first corner portion where the first flat surface intersects the distal end surface, on an outer side of the annular reference surface, a thickness of the distal-end-side curved portion being smaller than a thickness of the eye portions, the thickness of the distal-end-side curved portion becoming smaller from the first flat surface toward the distal end surface in a first length; and a hole-side curved portion which is formed at a second corner portion where the first flat surface intersects the inner surface of the through-hole all around the opening, on an inner side of the annular reference surface, characterized by a thickness of the hole-side curved portion being smaller than a thickness of the eye portions, the thickness of the hole-side curved portion becoming smaller from the first flat surface toward the inner surface in a length (H2, H3) less than the first length, the hole-side curved portion being curved with a curvature greater than that of the distal-end-side curved portion.