Abstract: A room-temperature-curable organopolysiloxane composition having a highly durable adhesion that bonds well to various substrates, e.g. glass, plastics, and metals, through contact-curing and exhibits an excellent early-cure adhesiveness and that cures to give a silicone rubber that is highly water-resistant and exhibits long-term retention of its bonding strength even in hostile ambients, e.g. immersion in hot water, comprises a composition of a hydroxyl-terminated or alkoxy-terminated organopolysiloxane, an inorganic filler, a rosin ester in which the ester is a polyol, a reaction mixture from aminoalkylalkoxysilane and epoxyalkylalkoxysilane, and a curing catalyst.