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 (C1) 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 (T1) 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 (H); and a hole-side curved portion which is formed at a second corner portion (C2) 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 (T1) 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 (H1), 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 (C1) 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 (T1) 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 (H); and a hole-side curved portion which is formed at a second corner portion (C2) 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 (T1) 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 (H1), the hole-side curved portion being curved with a curvature greater than that of the distal-end-side curved portion . <EOS>