To provide a method for connecting a reinforcement or the like simply connecting the reinforcement or the like without welding.

A joint is composed of a metal fitting 12, which is formed in a cylindrical shape, in which both sides are narrowed and throttled and which is formed in a size in an extent that one reinforcement or the like 11 can pass, and a short cylindrical centering metal fitting 14, which is stuck fast at the central section of the metal fitting 12, in which opening sections are installed in the same direction as the metal fitting 12 and which is inclined and formed so that the left-right opening sections 13 on both sides are opened outwards, and filler holes 15 consisting of a resin are formed on both sides of the centering metal fitting 14 in the metal fitting 12. When the reinforcement or the like 11 is connected, the reinforcement or the like 11 is inserted into the metal fitting 12 from both sides, the front ends are further inserted into the centering metal fitting 14 and abutted, and melted polypropylene is injected from the filler holes 15 and the inside of the metal fitting is filled with it.