PURPOSE: To obtain the anchor nail whose strength is strong and which can be manufactured easily, and also, to manufacture even that of a comparatively hard stock such as iron and stainless steel, etc.

CONSTITUTION: A wire rod made of iron, etc., is cut to necessary length. pressed to a shape whose cross section is roughly elliptical, a supporting member 3b is provided projectingly outwards right under the upper end, and also, by cutting obliquely the lower end, a pointed end is formed. This leg piece 3 is bundled by three pieces, and a washer 5 is fitted externally so as to be freely movable in the longitudinal direction. Subsequently, a wide annulus ring 14 is fitted externally from the upper end of each leg piece 3, 3 and 3, and a projecting part 28a of each leg piece projected a little to the upper part of the annulus ring 14 is spread out from the diagonal upper part, while turning it by a rotary pressure head 22 of an eccentric rotary pressing machine, each leg piece 3, 3 and 3 and the annulus ring 14 are joined mutually, and,an anchor nail maim body having a wide and circular head part is formed.