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While the polymer is characterized by comprising, in copo› lymerized form, recurring units (al) of acid labile group› substituted (meth)acrylic acid, styrenecarboxylic acid or vinylnaphthalenecarboxylic acid and/or recurring units (a2) having an acid labile group-substituted phenolic hydroxyl group, and preferably acid generator-bearing recurring units (bl) to (b3), recurring units (c) having a phenolic hydroxyl group as the adhesive group may be further copolymerized. 

Examples of the monomer from which recurring units ( c) having a phenolic hydroxyl group are derived are shown below. 

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