Photomask

A photomask comprising:

• a mask pattern formed on a transparent substrate and having a light shielding property with respect to exposing light;
• and
• a transparent portion of said transparent substrate where said mask pattern is not formed,
• wherein said transparent portion surrounds said mask pattern,
• said mask pattern includes a first pattern and a second pattern each having a line shape and having a mask enhancer structure including a phase shifter for transmitting said exposing light in an opposite phase with respect to said transparent portion and a shielding portion surrounding said phase shifter, and a third pattern located adjacent to said first pattern along a direction vertical to the line direction of said first pattern, at a distance not larger than a given distance and with a transparent portion sandwiched between said first pattern and said third pattern,
• an end portion of said first mask pattern and an end portion of said second mask pattern are surrounded by said transparent portion in three directions of the end portion of the first mask pattern and the end portion of the second mask pattern,
• the outermost region in said mask pattern is said shielding portion, and the outmost region of said third pattern is a shielding pattern,
• a first phase shifter in said first pattern is a line-shaped pattern having a first line width with a predetermined width,
• a second phase shifter in said second pattern is a line-shaped pattern having a second line width with a predetermined width,
• said first line width is smaller than said second line width, and
• a pattern width of said first pattern in a short side direction is the same as a pattern width of said second pattern in a short side direction.