An adhesive composition comprising: a (meth)acrylic polymer which is a polymer of monomer components comprising 55 to 99 mass% of at least one (meth)acrylic acid ester selected from an alkoxyalkyl (meth)acrylate ester and an alkyl (meth)acrylate ester having an alkyl group having 4 to 12 carbon atoms, 0.5 to 15 mass% of a crosslinkable functional group-containing monomer other than an amino group-containing monomer, and 0.01 to 5 mass% of an amino group-containing monomer; an acid-modified polyolefin; at least one tackifier resin selected from a rosin tackifier resin and a terpene phenol tackifier resin; and a crosslinking agent, the adhesive composition satisfying the following requirements to: a value of a ball tack test performed by a J. Dow method described in the description using an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is 5 or less, an adhesive force in measurement after an adhesive surface of an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is bonded to a polypropylene plate and left to stand for 20 minutes in an environment at 80°C is 10.0 N/25 mm or more, measured by the method used in the description, and when a test piece in which an adhesive surface of an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is bonded to a polypropylene plate in an area of 50 mm × 20 mm is left to stand for 20 minutes in an environment at 80°C and then a load of 200 g is applied to an end portion on one end side in a longitudinal direction of the test piece in an environment at 80°C, a peeling amount of the adhesive layer after 1 hour from the start of application of a load is 30 mm or less. a (meth)acrylic polymer which is a polymer of monomer components comprising 55 to 99 mass% of at least one (meth)acrylic acid ester selected from an alkoxyalkyl (meth)acrylate ester and an alkyl (meth)acrylate ester having an alkyl group having 4 to 12 carbon atoms, 0.5 to 15 mass% of a crosslinkable functional group-containing monomer other than an amino group-containing monomer, and 0.01 to 5 mass% of an amino group-containing monomer; an acid-modified polyolefin; at least one tackifier resin selected from a rosin tackifier resin and a terpene phenol tackifier resin; and a crosslinking agent, the adhesive composition satisfying the following requirements to: a value of a ball tack test performed by a J. Dow method described in the description using an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is 5 or less, an adhesive force in measurement after an adhesive surface of an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is bonded to a polypropylene plate and left to stand for 20 minutes in an environment at 80°C is 10.0 N/25 mm or more, measured by the method used in the description, and when a test piece in which an adhesive surface of an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is bonded to a polypropylene plate in an area of 50 mm × 20 mm is left to stand for 20 minutes in an environment at 80°C and then a load of 200 g is applied to an end portion on one end side in a longitudinal direction of the test piece in an environment at 80°C, a peeling amount of the adhesive layer after 1 hour from the start of application of a load is 30 mm or less. a value of a ball tack test performed by a J. Dow method described in the description using an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is 5 or less, an adhesive force in measurement after an adhesive surface of an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is bonded to a polypropylene plate and left to stand for 20 minutes in an environment at 80°C is 10.0 N/25 mm or more, measured by the method used in the description, and when a test piece in which an adhesive surface of an adhesive layer having a thickness of 50 μm obtained from the adhesive composition is bonded to a polypropylene plate in an area of 50 mm × 20 mm is left to stand for 20 minutes in an environment at 80°C and then a load of 200 g is applied to an end portion on one end side in a longitudinal direction of the test piece in an environment at 80°C, a peeling amount of the adhesive layer after 1 hour from the start of application of a load is 30 mm or less.