A room-temperature-curable organopolysiloxane composition comprising as essential components: (A) 100 parts by mass of an organopolysiloxane shown by the following general formula , having a viscosity at 23°C of 50 to 50,000 mPa·s measured with a rotational viscometer, wherein R represents a methyl group or an ethyl group, R 1 represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, X represents an integer of 10 or more, Y represents an oxygen atom or an alkylene group having 1 to 5 carbon atoms, and N independently represents an integer of 0 or 1; (B) 0.1 to 5 parts by mass of an alkoxysilane shown by the following general formula or a partial hydrolysate thereof, R 2 4-n Si(OR) n wherein R has the same meaning as above, R 2 represents a vinyl group, a halogen-substituted alkyl group, or an alkyl group having 1 to 6 carbon atoms, and n represents an integer of 2 to 4; (C) 0.5 to 10 parts by mass of a silazane compound shown by the following general formula , wherein R 3 represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a vinyl group, and all R 3 may be the same or different; (D) 0.01 to 5 parts by mass of a bismuth compound shown by the following general formula which is in a liquid state at 20°C, a partial hydrolysate thereof, or both of them, Bi(OCOR 4 ) 3 wherein R 4 represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms; (E) 1 to 300 parts by mass of one or more fillers; and (F) 0.05 to 15 parts by mass of a silane coupling agent having one or more amine structures or imine structures per molecule; a mass ratio of the component (C) to the component (B) satisfying [component (C)/component (B)≥1.0]. (A) 100 parts by mass of an organopolysiloxane shown by the following general formula , having a viscosity at 23°C of 50 to 50,000 mPa·s measured with a rotational viscometer, wherein R represents a methyl group or an ethyl group, R 1 represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, X represents an integer of 10 or more, Y represents an oxygen atom or an alkylene group having 1 to 5 carbon atoms, and N independently represents an integer of 0 or 1; (B) 0.1 to 5 parts by mass of an alkoxysilane shown by the following general formula or a partial hydrolysate thereof, R 2 4-n Si(OR) n wherein R has the same meaning as above, R 2 represents a vinyl group, a halogen-substituted alkyl group, or an alkyl group having 1 to 6 carbon atoms, and n represents an integer of 2 to 4; (C) 0.5 to 10 parts by mass of a silazane compound shown by the following general formula , wherein R 3 represents a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or a vinyl group, and all R 3 may be the same or different; (D) 0.01 to 5 parts by mass of a bismuth compound shown by the following general formula which is in a liquid state at 20°C, a partial hydrolysate thereof, or both of them, Bi(OCOR 4 ) 3 wherein R 4 represents a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms; (E) 1 to 300 parts by mass of one or more fillers; and (F) 0.05 to 15 parts by mass of a silane coupling agent having one or more amine structures or imine structures per molecule; a mass ratio of the component (C) to the component (B) satisfying [component (C)/component (B)≥1.0]. <EOS>