Patent ID: 7799506

Claim:
A positive resist composition, comprising: (A) a resin containing a repeating unit represented by formula (I), of which solubility in an alkali developer increases under an action of an acid; and (B) a compound capable of generating an acid upon irradiation with actinic rays or radiation: wherein Ra and Rb each independently represents a hydrogen atom, an alkyl group, a hydroxyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group, an acyl group, an acyloxy group, a cycloalkyl group, an aryl group, a carboxyl group, an alkyloxycarbonyl group, an alkylcarbonyloxy group or an aralkyl group; Z represents an alkyl group, an alkoxy group, a halogen atom, a cyano group, a nitro group, an acyl group, an acyloxy group, a cycloalkyl group, a carboxyl group, an alkyloxycarbonyl group, an alkylcarbonyloxy group or an aralkyl group; Z 1 represents a non-acid-decomposable group; Y represents a single bond or a linking group; m represents 1 or 2; and k represents an integer of 0 to 4, n represents an integer of 1 to 5, provided that 1≦k+n≦5, when a plurality of m's, Y's, Z's or Z 1 's are present, the plurality of m's, Y's, Z's or Z 1 's may be the same or different, and when a plurality of Z 1 's are present, the plurality of Z 1 's may combine with each other to form a ring.