Patent ID: 7001711

Claim:
A patterning method using a photomask, characterized in that it comprises the steps of: forming a resist film on a substrate; conducting pattern exposure to the resist film using the photomask; and developing the resist film subjected to the pattern exposure so as to form a resist pattern, wherein the photomask includes an isolated light-shielding pattern formed on a transparent substrate that is transparent to an exposure light, and is characterized in that the light-shielding pattern is formed from a light-shielding film region formed from a light-shielding film, and a phase shift region having an opposite phase with respect to a light-transmitting region of the transparent substrate which has no light-shielding pattern, the light-shielding pattern includes at least a first light-shielding pattern having a first width and a second light-shielding pattern having a second width larger than the first width, a first phase shift region, which is part of the phase shift region and is surrounded by the light-shielding film region, is provided in a portion of the first light-shielding pattern, and only the light-shielding film region is provided in the second light-shielding pattern.