To inexpensively provide a metal-made belt the durability of which is improved.

The metal-made belt 100 is formed as a ring structure in which a coil material is formed into a ring by constituting a spring steel wire 10 into the coil wound helically in which circular loops are repeated. Thereby, the metal-made belt 100 can obtain properties of a tensile coil spring of which the coil-shaped portion has elasticity with it by forming the coil shape wound helically. By this, the metal-made belt 100 can be mounted and installed easily while being elongated between a driving motor and a pulley or between the pulleys fixed on an attachment casing. In addition, the metal-made belt 100 retains constant tension and has permanency with it against position variations with shafts of the driving motor and the pulley.