Block copolymer composition for hot melt adhesive

A block copolymer composition for a hot melt adhesive, comprising a block copolymer A represented by the following formula (A) and a block copolymer B represented by the following formula (B), wherein:

• an aromatic vinyl monomer unit content of the block copolymer A is 30% to 50% by weight;
• an aromatic vinyl monomer unit content of the block copolymer B is 15% to 25% by weight;
• a content of the aromatic vinyl monomer units relative to all polymer components of the block copolymer composition is 18% to 45% by weight;
• a weight ratio (A/B) of the block copolymer A with respect to the block copolymer B is 20/80 to 80/20;
• and
• a ratio (MwA/MwB) of a weight average molecular weight of the block copolymer A (MwA) with respect to a weight average molecular weight of the block copolymer B (MwB) is 0.65 to 1.5:
• Ar1a-Da-Ar2a (A)
• Arb-Db (B)
• in the formula (A) and the formula (B), Ar1a and Arb each represent an aromatic vinyl polymer block having a weight average molecular weight of 10,000 to 18,000;
• Ar2a represents an aromatic vinyl polymer block having a weight average molecular weight of 20,000 to 40,000, with a difference between the weight average molecular weight of Ar2a and the weight average molecular weight of Ar1a being 5,000 to 30,000;
• and Da and Db each represent a conjugated diene polymer block having a weight average molecular weight of 80,000 to 150,000.