To provide a duct suspension band to be generally used regardless of the duct diameter.

A screw 7a is formed at the lower end of a shaft material 7 suspended from a slab on the ceiling. A horizontal part on one end side of an L-shaped clamp 8 is engaged with the screw 7a, and a hole 8a is bored in a vertical part on the other end side of the L-shaped clamp 8. The suspension band 1 has holes 2a and 2b in both ends, forming a ring for suspending a duct by engaging a male member 15 and a female member 16 with the holes 2a, 2b and the hole 8a of the L-shaped clamp 8. Before or after the ring is formed, an air conditioning duct is inserted into the ring and supported.