[Problem] To provide a durable overcoating material for metals such as silver thin film having higher adhesiveness. [Solution] A metallic material adhesion aid comprising a hyperbranched polymer obtained by polymerizing a polymerizable compound, containing at least a monomer A having two or more radical polymerizable double bonds in the molecule and a monomer B selected from the group comprising compounds b1 having a group selected from the group comprising a monoalkylamino group, dialkylamino group, nitrogen-containing heterocyclic group, trialkoxysilyl group, and epoxy group and at least one radical polymerizable double bond in the molecule and compounds b2 represented by formula [1], in the presence of 5-200 mol% of a polymerization initiator C relative to the number of moles of said monomer A. [Formula 1] (In the formula, X represents an oxygen atom or NR1. Here, R1 represents a hydrogen atom, alkyl group having from 1 to 10 carbon atoms, optionally substituted aromatic group having from 6 to 10 carbon atoms, or hydroxy group.)
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