NOVELTY - A curable composition comprises polyether polymer (A) which has a reactive silicon group (I), polyether polymer (B) which has a reactive silicon group (II) and (meth)acrylic-type polymer (C) which has a reactive silicon group (III).    USE - Curable composition is used for sealing material, adhesive agent and contact adhesive (all claimed). Uses include but are not limited to solar cell, electric wire, insulation coating material for cables, casting material, food-packing material, sizing board, primer, hot-melt material, fluid sealant agent for gasket, material for electrical components and machine components, etc.    ADVANTAGE - The curable composition has excellent curing properties. The cured product has excellent tensile strength and elongation.    DETAILED DESCRIPTION - A curable composition comprises polyether polymer (A) which has a reactive silicon group of formula: -W'-CH2-SiR1aR2bXc (I), polyether polymer (B) which has a reactive silicon group of formula: -V'-SiR2dX3-d (II) and (meth)acrylic-type polymer (C) which has a reactive silicon group of formula: -Z-(CH2)n-SiR1aR2bXc (III).    R1=1-20C hydrocarbyl in which third position carbon atom is substituted by H, OR3, -NR4R5, -N=R6 or -SR7;    R3-R5=H or optionally substituted 1-20C hydrocarbyl;    R6,R7=optionally substituted 1-20C bivalent hydrocarbyl, 1-20C perfluoroalkyl or cyano;    R2=1-20C hydrocarbyl, 6-20C aryl, 7-20C aralkyl or triorganosiloxy group of formula: (R0)3SiO-;    R0=1-20C hydrocarbyl;    X=hydroxy or hydrolyzable group;    W'=-O-R8-, -O-CO-N(R9)-, -N(R9)-CO-O-, -N(R9)-CO-N(R9)-, -S-CO-NH-, -NH-CO-S- or -S-;    R8=1-8C bivalent hydrocarbyl;    R9=H or 1-18C hydrocarbyl optionally substituted by halo;    V'=2-8C bivalent hydrocarbyl;    d=0-2;    Z=-CO-O-, -O-CO-N(R9)-, -N(R9)-CO-O-, -N(R9)-CO-N(R9)-, -S-CO-NH-, -NH-CO-S- or -S-;and    n=1-8.    (i) When W' is -O-R8-, a and c are 1 or 2, b is 0 or 1 and sum of a, b and c is 3; and (ii) When W' is group except -O-R8-, a and b are 0-2, c is 1-3 and sum of a, b and c is 3. An INDEPENDENT CLAIM is included for hardened material of curable composition.