The subject of the invention is to provide a curing composition which uses a non-organic tin catalyst and has good curing property, bonding property and storage stability. The invention solves the subject by the following curing composition, that is, the invention is a curing composition which is composed of an organic polymer (A) which has a reactive silicon-containing group and a silanol condensation catalyst (B) containing at least one compound selected from organic tin compound, carboxylic acid and amine compound; the curing composition is characterized in that at least one part of the reactive silicon-containing group of the organic polymer (A) is the radical which is represented by a general formula (1); the general formula (1) is -(CR2<2>)2-(SiR<1>2-aXaO)m-SiX3; the silanol condensation catalyst (B) contains the amine compound (B1) or contains the amine compound (B1) and carboxylic acid (B2); when the amine compound is taken as 1, the total amount of carboxylic acid is below 0.1 accounted by the mole ratio.