<p>Disclosed is a curable composition which is excellent in surface curability and deep-section curability without using an organotin curing catalyst which is pointed out to be toxic. This curable composition enables to obtain a cured product having excellent adhesion. Specifically disclosed is a curable composition containing an organic polymer (A) having a silicon-containing group which can be crosslinked by forming a siloxane bond, and a guanidine compound (B-1) represented by the general formula (1) below as a silanol condensation catalyst (B). R<SUP>1</SUP>N=C(NR<SUP>1</SUP> <SUB>2</SUB>)</p>
