a method for manufacturing an eccentrically expanded pipe in which the plate thickness of the peripheral surface on the large expanding side that tends to easily produce cracks and necking is suppressed from becoming thin is provided . the problem is solved with a method for manufacturing an eccentrically expanded pipe plastically deforming an end of a pipe to an eccentrically expanded pipe part through an eccentrically expanding step ; said eccentrically expanding step includes a first eccentrically expanding step , expanding an peripheral surface of the end of the pipe opposing to a peripheral surface finally expanded to be a final product , and a second eccentrically expanding step , expanding the peripheral surface finally expanded to be the final product .