In a blade shape creation program and method, a camber line defining equation for defining a camber line to be defined on a cross section of a blade shape is constructed by a cubic function as a first function defining a leading edge camber line on a leading edge side of a maximum camber point on the camber line, and a cubic function as a second function defining a trailing edge camber line on a trailing edge side of the maximum camber point on the camber line; is defined, with a chord length, a position of maximum camber, a maximum camber value, an inflow angle, and a discharge angle of the camber line being taken as design factors; and has the boundary condition that the first function and the second function have tangents continuous with each other at the maximum camber point.