Patent ID: 7592122

Claim:
A photoresist composition comprising: (A) a base resin component having alkali-solubility changed by the action of an acid; and (B) an acid generator for generating an acid by irradiation with radiation rays, wherein the base resin component (A) comprises a compound having an alkali-soluble site (i), at least a part of the alkali-soluble site (i) is protected with (ii) a halogen atom-containing acetal type dissolution inhibiting group, and the dissolution inhibiting group (ii) ) is a group represented by the following general formula (1): —O—C(R 1 )(R 2 )—O—R 3 (1) wherein R 1 and R 2 independently represent a hydrogen atom or a lower alkyl group, and R 3 is a group represented by the following general formula (2): —[C(R 5 )(R 6 )] n —R 4 (2) wherein R 4 is a halogen-containing norbornenyl group, R 5 and R 6 independently represent a hydrogen atom or a lower alkyl group, and n is 0 or an integer of 1 to 3, wherein the alkali-soluble site (i) is at least one member selected from the group consisting of an alcoholic hydroxyl group and a hydroxyl group of a carboxyl group.