NOVELTY - A curable polyorganosiloxane composition comprises main composition (A) comprising 100 parts mass polyorganosiloxane (A') having molecular chain blocked with terminal hydroxyl group, 1-300 parts mass filler (C), 0.1-20 parts mass resin (E) having polyorganosiloxane structure (I), 0.1-20 parts mass silane compound (II) having trifunctional or tetrafunctional property, and/or its partially hydrolyzed condensate and 0.1-10 parts mass primary amino group-containing silicon compound (IV), and curing agent composition (B) comprising secondary amino group-containing silicon compound (V).    USE - Curable polyorganosiloxane composition. Uses include but are not limited to elastomeric component for solar system component, motor vehicle component, electrical/electronic device component, coating material, gasket, potting material and sealing material for construction.    ADVANTAGE - The cured component formed using the curable polyorganosiloxane composition has excellent hydrolysis resistance, adhesiveness and hardness even under high-temperature condition and high-humidity condition.    DETAILED DESCRIPTION - A curable polyorganosiloxane composition comprises main composition (A) comprising 100 parts mass polyorganosiloxane (A') having molecular chain blocked with terminal hydroxyl group and viscosity of 0.1-100 Pa.second at 23 degrees C, 1-300 parts mass filler (C), 0.1-20 parts mass resin having polyorganosiloxane structure of formula: (R13SiO1/2)p(Si(OH)xO(4-x)/2)q (I), 0.1-20 parts mass silane compound of formula: R2nSi(OR3)4-n (II) having trifunctional or tetrafunctional property, and/or its partially hydrolyzed condensate and 0.1-10 parts mass primary amino group-containing silicon compound of formula: (R4O)3Si-R5-NH-R6 (IV), and curing agent composition (B) comprising 0.1-10 parts mass secondary amino group-containing silicon compound of formula: (R7O)3-mR8mSi-R9-NH-R9-SiR8l (V). The curing agent composition does not contain curing catalyst having metal atom.    R1=1-20C monovalent hydrocarbyl;    x=0.001-0.8;    p,q=positive number;    R2,R4,R7,R8=optionally substituted monovalent hydrocarbyl;    n=0 or 1;    R5,R9=optionally substituted bivalent hydrocarbyl;    R6=H, optionally substituted monovalent hydrocarbyl or aminoalkyl;and    m,l=0-2.