Semiconductor device manufacturing method and semiconductor device

Abstract

A semiconductor device manufacturing method comprises a step of forming a trench to a first insulation film formed on a semiconductor substrate, and forming a lower level wiring in the trench, a step of forming at least one conductive layer on the semiconductor substrate to coat the lower level wiring, a step of forming at least one thin film layer on the conductive layer, a step of forming a hard mask by patterning the thin film, a step of etching the conductive layer by using the hard mask as an etching mask, and forming a conductive pillar-shaped structure, whose upper surface is covered with the hard mask, on the lower level wiring, a step of forming a second insulation film on the semiconductor substrate so that the pillar-shaped structure is buried, a step of forming a wiring trench in which at least the hard mask is exposed, and a step of burying a conductor into the wiring trench after the hard mask is removed, and forming an upper level wiring in the wiring trench.