To provide a fastening band which is simplified in constitution, is excellent in productivity, makes sure of the sealing capability of a member to be fastened, and is also excellent in workability and handling properties.

In a fastening band 1 in which both the end surfaces of a metallic band member 2 are overlapped each other so as to be formed into a ring shape, and a fastening lug 3 which is folded in a portal shape, is provided for the outer side of an outer side band part B in an overlapped part, the end part 2a of an inner side band part A at the overlapped part, is formed in a fork shape, both the sides in the width direction of the outer side band part B are warped outward at the specified position of the outer side band part B so as to allow dents 8 and 8 capable of housing the fork shaped end part 2a to be formed, and the band member 2 formed in a ring shape is contracted in diameter by letting the fastening lug 3 be nipped with pressure, and crushed, so that the aforesaid fork shaped end part 2a is thereby housed in the dents 8 and 8.