To provide a reversible air-permeable fabric rapidly responsive to a change in moisture and water content, reversibly changing the air permeability and regulating the weather in clothes.

The reversible air-permeable fabric is a fabric such as a woven fabric or a knitted fabric comprising ≥10 wt.% of swellable conjugated fibers in which a highly swellable component having 30-200% degree of water swelling and a low swellable component having ≤20% degree of water swelling are joined in a parallel arrangement structure. The air permeability during water swelling and during non-swelling is reversibly changed and the difference between a state of 50 wt.% moisture content of the fabric and a state of 25°C and 65%RH equilibrium in air permeability is ≥10%.