A positive resist composition, comprising: a resin containing a repeating structural unit represented by formula and being capable of decomposing by an action of an acid to increase a solubility of the resin in an alkali developer; a compound capable of generating an acid upon irradiation with an actinic ray or radiation; and a mixed solvent containing at least one solvent selected from the group consisting of the following Group (a) and at least one solvent selected from the group consisting of the following Group (c): Group (a): an alkylene glycol monoalkyl ether, Group (c): a linear ketone, a branched chain ketone, and a cyclic ketone: wherein R 1 represents a hydrogen atom, a halogen atom or an alkyl group; R 2 represents an alkyl group; R 3 represents a halogen atom, an alkyl group, a cycloalkyl group, a cyano group or a hydroxyl group, and when a plurality of R 3 's are present, the plurality of R 3 's are the same or different; n represents 0 or a positive integer; and Z represents a cyclic alkyl group having a carbon number of 3 to 8, wherein the resin as the component further contains a repeating unit represented by formula: wherein R 2-1-3 represents a hydrogen atom, a halogen atom or an alkyl group; R 2-1-4 and R 2-1-5 each independently represents an alkyl group or a cycloalkyl group; R 2-1-10 represents a substituent containing a polar group; and n 2-1 represents an integer of 0 to 15. a resin containing a repeating structural unit represented by formula and being capable of decomposing by an action of an acid to increase a solubility of the resin in an alkali developer; a compound capable of generating an acid upon irradiation with an actinic ray or radiation; and a mixed solvent containing at least one solvent selected from the group consisting of the following Group (a) and at least one solvent selected from the group consisting of the following Group (c): Group (a): an alkylene glycol monoalkyl ether, Group (c): a linear ketone, a branched chain ketone, and a cyclic ketone: wherein R 1 represents a hydrogen atom, a halogen atom or an alkyl group; R 2 represents an alkyl group; R 3 represents a halogen atom, an alkyl group, a cycloalkyl group, a cyano group or a hydroxyl group, and when a plurality of R 3 's are present, the plurality of R 3 's are the same or different; n represents 0 or a positive integer; and Z represents a cyclic alkyl group having a carbon number of 3 to 8, wherein the resin as the component further contains a repeating unit represented by formula: wherein R 2-1-3 represents a hydrogen atom, a halogen atom or an alkyl group; R 2-1-4 and R 2-1-5 each independently represents an alkyl group or a cycloalkyl group; R 2-1-10 represents a substituent containing a polar group; and n 2-1 represents an integer of 0 to 15. Group (a): an alkylene glycol monoalkyl ether, Group (c): a linear ketone, a branched chain ketone, and a cyclic ketone: wherein R 1 represents a hydrogen atom, a halogen atom or an alkyl group; R 2 represents an alkyl group; R 3 represents a halogen atom, an alkyl group, a cycloalkyl group, a cyano group or a hydroxyl group, and when a plurality of R 3 's are present, the plurality of R 3 's are the same or different; n represents 0 or a positive integer; and Z represents a cyclic alkyl group having a carbon number of 3 to 8, wherein the resin as the component further contains a repeating unit represented by formula: wherein R 2-1-3 represents a hydrogen atom, a halogen atom or an alkyl group; R 2-1-4 and R 2-1-5 each independently represents an alkyl group or a cycloalkyl group; R 2-1-10 represents a substituent containing a polar group; and n 2-1 represents an integer of 0 to 15. wherein R 1 represents a hydrogen atom, a halogen atom or an alkyl group; R 2 represents an alkyl group; R 3 represents a halogen atom, an alkyl group, a cycloalkyl group, a cyano group or a hydroxyl group, and when a plurality of R 3 's are present, the plurality of R 3 's are the same or different; n represents 0 or a positive integer; and Z represents a cyclic alkyl group having a carbon number of 3 to 8, wherein the resin as the component further contains a repeating unit represented by formula: wherein R 2-1-3 represents a hydrogen atom, a halogen atom or an alkyl group; R 2-1-4 and R 2-1-5 each independently represents an alkyl group or a cycloalkyl group; R 2-1-10 represents a substituent containing a polar group; and n 2-1 represents an integer of 0 to 15.