Patent ID: 8435702

Claim:
A manufacturing method of a semiconductor device comprising the steps of: (a) forming a base film on a semiconductor substrate; (b) forming a resist film on the base film; (c) patterning the resist film; and (d) patterning the base film by using the patterned resist film, wherein the step (c) includes: (c1) a step of making extreme ultra violet light be incident on an illumination optical system and making the extreme ultra violet light from the illumination optical system be incident obliquely on a mask having a pattern formed thereon; and (c2) a step of making extreme ultra violet light reflected obliquely from the mask be incident on an imaging optical system, and irradiating the extreme ultra violet light from the imaging optical system on the resist film formed on the semiconductor substrate, the mask including: a mask substrate having a first region and a second region; a multilayer film formed in the first region and the second region of the mask substrate, the multilayer film reflecting the extreme ultra violet light; and an absorber formed on the multilayer film so as to extend, in plan view, in a first direction, the absorber absorbing the extreme ultra violet light, the mask having a difference in level extending, in plan view, in a second direction in a boundary between the multilayer film formed in the first region and the multilayer film formed in the second region, the first direction intersecting the second direction, wherein after the extreme ultra violet light is reflected from the mask on which the pattern including the difference in level and the absorber is formed, the extreme ultra violet light is irradiated on the resist film, thereby patterning the resist film so as to correspond to the pattern formed on the mask, and wherein a direction of a projective component projected on a mask surface out of a direction cosine component of a ray direction of the extreme ultra violet light incident obliquely on the mask is substantially parallel with the first direction in which the absorber extends.