A semiconductor device includes a first insulation layer including a first conductor pattern, a second insulation layer formed on the first insulation layer and including a second conductor pattern, and a third conductor pattern formed on the second insulation layer,wherein there is formed a first alignment mark part in the first insulation layer by a part of the first conductor pattern, the third conductor pattern is formed with a second alignment mark part corresponding to the first alignment mark part, the first and second alignment marks forming a mark pair for detecting alignment of the first conductor pattern and the third conductor pattern, the second conductor pattern being formed in the second insulation layer so as to avoid the first alignment mark part.