To provide an inflatable boat and its manufacturing method which can largely reduce labor of buff covering work in relation to the inflatable boat.

A tube-shaped air body a1 is formed by covering a buff over the whole rubber surface exposed on the surface side of a rubber drawing cloth, cutting partial clothes constituting each portion 1'... of the air body a1 of a boat body (a) from the rubber drawing cloth, and overlapping and adhering overlap widths provided at peripheral edges of these partial clothes. Labor of buff covering work is reduced by covering the buff over the whole surface of the partial clothes.