Patent ID: 8887449

Claim:
A benchmark marking tool provided for a structure of a building on a surface of which a coating layer is formed comprising: a marking plate having an upper surface in a flat shape to which a benchmark is marked; a stud extending from a back surface of the upper surface of the marking plate and configured to be buried in a structure of a building to fix the marking plate to the surface of the structure; an outer peripheral flange provided entirely around the marking plate in a manner such that an upper surface of the outer peripheral flange positioned below an upper surface level of the marking plate, and a seal portion formed between an upper surface of the outer peripheral flange and the coating layer formed on the surface of the structure when the marking plate is buried in the structure, wherein, in a state in which the benchmark making tool is provided for the structure of a building on which the coating layer is formed, the upper surface of the marking plate is arranged so as to take a position to be flush with or below the upper surface level of the coating layer formed on the structure of a building, and the upper surface of the outer peripheral flange is buried in the structure of the building to thereby form a seal portion at a boundary to the coating.