Disclosed is an adhesive composition (I) characterized by containing a polyurethane polyurea resin (A) having a weight average molecular weight of 80,000-250,000 and an acid number of 3-25 mgKOH/g and an epoxy resin (B). The polyurethane polyurea resin (A) is obtained by reacting a urethane prepolymer (d) having an isocyanate group, a polyamino compound (e) and a monoamino compound (f) under the conditions stated below. The urethane prepolymer (d) having an isocyanate group is obtained by reacting a polyol compound (a), an organic diisocyanate (b) and a diol compound (c) having a carboxyl group. (i) The ratio between isocyanate groups of the urethane prepolymer (d) having an isocyanate group and amino groups of the polyamino compound (e) and the monoamino compound (f), namely amino groups/isocyanate groups is from 0.8/1 to 0.999/1 (molar ratio). (ii) The ratio of amino groups of the polyamino compound (e) in the 100 mol% of the total of the amino groups of the polyamide compound (e) and the amino groups of the monoamino compound (f) is 90.0-97.0 mol%.