PURPOSE: A nail and wire with a groove are provided to increase connecting force by making turning or separating of the nail difficult by increasing frictional force. CONSTITUTION: A sharp edge(120) is formed on bottom of a body(110) and is easily stuck on a wall. A protrusion(140) surrounds a groove(130) which becomes narrower to get closer to an outer circumference of the body portion and sharp edge in longitudinal direction of a nail. A holder groove pulling out the nail is located in the protrusion of top part(141) of the body.
