Abstract: An anchor is used for anchoring a hull or a floating body on the water. When the anchor of the present invention is made to land on the bottom of the water, left and right bills and a lower auxiliary bill encroach the bottom of the water and thus to make anchoring positive, and as a shank, bills and a bill stopping frame are relatively thin, said anchor is lighter than the conventional anchors. Consequently the resistance of the sediment in the bottom of the water is minimized with respect to the encroachment, and therefore the work and labor during casting and weighing said anchor can be relieved.