PURPOSE: To obtain an adhesive which is useful for fixing a resin plate or a metal plate by bonding since it can, for instance, prevent the distortion of a material to be bonded, by mixing a polyisocyanate compound, a polyol compound, an inorganic filler, and a catalyst so as to satisfy specified conditions.

CONSTITUTION: A urethane-base adhesive composition which consists of a polyisocyanate compound (A) having two or more terminal isocyanate groups, a polyol compound (B), an inorganic filler, and a catalyst, and satisfies the following conditions (a) to (d): (a) the isocyanate groups of a diisocyanate compound account for at least 80 equivalent % of total isocyanato groups of the polyisocyanate compound A; (b) the OH groups of a low-molecular-weight polyol compound having a molecular weight of 300 or lower account for 40W80 equivalent % of total OH groups of the polyol compound B; (c) the OH groups of a high-molecular-weight polyol compound having a molecular weight of 1,000 or higher account for 20W60 equivalent% of total OH groups of the polyol compound B; and (d) zeolite is used as an inorganic filler.