A hot melt adhesive agent composition according to the present invention is characterized by comprising: 100 parts by weight of a thermoplastic block copolymer (A) that comprises at least one component selected from the group consisting of a styrene isoprene styrene block copolymer having a styrene component content of 15 to 35 wt% a styrene butadiene styrene block copolymer having a styrene component content of 15 to 35 wt% and a styrene butadiene/butylene styrene block copolymer having a styrene component content of 15 to 35 wt% 0.05 to 10 parts by weight of a liquid rubber (B) having a carboxyl group and/or a carboxylic acid anhydride group in the molecule and an adhesiveness imparting resin (C).
