An anchor includes an anchor shank, a fluke disposed on the leading terminal side of the anchor shank as folded back therefrom, and a buoyancy part disposed on the leading terminal side of the anchor shank. The buoyancy part has a buoyant force that causes the leading terminal side of the anchor shank to rise upward and the basal terminal side thereof to contact the water bottom when the anchor is positioned on the water bottom, allows the leading terminal part of the fluke to remain in contact with the water bottom under its own weight, and enables the fluke to retain a posture for forming a given inserting angle relative to the water bottom.
