A curable composition is disclosed, including (A) an oxypropylene polymer having a narrow molecular weight distribution which does not have any branched chain, is linear and has at least one reactive silicon atom-containing group; and (B) an oxypropylene polymer having a narrow molecular weight distribution which has at least one branched chain and at least one reactive silicon atom-containing group. Cured articles obtained from the curable composition have a tear strength which is unexpectedly higher than the tear strength of the cured article of the component (A) alone or the component (B) alone.