A balloon which has first and second multilayered sheets superimposed together and melt-bonded at a peripheral portion thereof; on the outer surface of the first multilayered sheet, is formed a film being acceptable for ink supplied from a printer, so that a design can be arbitrarily printed with the aid of a printer used at home, i.e. ink jet type printer. A balloon is arranged such that the first multilayered sheet is lighter than the second multilayered sheet by a weight equivalent to that of the film formed on the first multilayered sheet, so that the balloon can keep its posture when Helium gas is injected thereinto.