To provide an adhesive composition which can effectively improve the
thermal-peeling-easy properties and the adhesion properties at low
temperature at the same time. An adhesive composition comprising a
crystalline polymer which comprises polyol units formed from a
crystalline polyol as repeating units in the molecule, and a tackifying
polymer compatible with said crystalline polymer at a temperature higher
than the melting point of said crystalline polymer, wherein the
tackifying polymer has an alkyl group with 4 to 8 carbon atoms and a
carboxyl group in the molecule, a content of the monomeric units having
the alkyl group with 4 to 8 carbon atoms (repeating units derived from a
starting monomer having the alkyl group) is 60 to 99 mole % of the whole
monomeric units of the tackifying polymer, and the alkyl group includes a
butyl group.