Active-energy-ray-curable resin composition and metal-thin-film undercoat agent

An active energy ray-curable resin composition comprising as essential components:

• an acryl-modified alkyd resin (A) obtainable by modifying oil-modified alkyd resin with a hydroxyl group-containing (meth)acrylate monomer having a weight-average molecular weight (Mw) of 50,000 to 700,000;
• a (meth)acrylate monomer (B);
• a phenolic compound (C) represented by the following structural formula (1)
• wherein R1 is a hydrogen atom or a hydrocarbon group, R2's each independently represent a hydrocarbon group, an alkoxy group or a halogen atom, and m is 0 or an integer of 1 to 4);
• and
• a photopolymerization initiator (D) having a structural moiety represented by the following structural formula (2)
• wherein R3's are any of an aliphatic hydrocarbon group, an aryl group, an aralkyl group, an alkoxy group, a hydroxyl group and an amino group, wherein two or more of the R3's may form a ring structure, R's each independently represent a hydrocarbon group, an alkoxy group or a halogen atom, and n is 0 or an integer of 1 to 5;
• wherein the total amount of the acryl-modified alkyd resin (A) and the (meth)acrylate monomer (B) is 80 parts by mass or more with respect to 100 parts by mass of a total solid resin content, and
• the mass ratio of the acryl-modified alkyd resin (A) and the (meth)acrylate monomer (B) [(A)/(B)] is 50/50 to 80/20.