Vehicle stabilizer, processing device for eye portion of stabilizer, and processing method for eye portion

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 a right angle to the first flat surface and the second flat surface;
• a through-hole which includes an inner surface at a 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;
• 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 reduced in a range of a first length from the first flat surface toward the distal end surface;
• 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, a thickness of the hole-side curved portion being reduced in a range less than the first length from the first flat surface toward the inner surface, the hole-side curved portion being curved with a curvature greater than that of the distal-end-side curved portion.