To provide a helical gear molding device with which an accuracy of a work shape becomes high.

This helical gear molding device is equipped with a mandrel 20 which has a space 21 formed on its peripheral in a way slanting from a line parallel to a mandrel axial core, and a drawing die 10 arranged outside of the mandrel 20 and has a bevel 11 slanting in a direction to the mandrel 20 in a manner that the bevel approaches to the mandrel 20 as it goes to the core direction. On the bevel 11 of the drawing die 10, a space 12, which has a lead of the same direction as the space 21 of the mandrel 20, is installed.