A chemically amplified positive photoresist composition for thick film that is used for forming a thick-film photoresist layer with a film thickness of 10 to 150 .mu.m on top of a support, including (A) a compound that generates acid on irradiation with active light or radiation, and (B) a resin that displays increased alkali solubility under the action of acid, wherein the component (B) includes a resin formed from a copolymer containing a structural unit (b1) with a specific structure.

 
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