NOVELTY - A room temperature-curing-type organopolysiloxane composition comprises 100 parts mass linear organopolysiloxane (A), 0.1-15 parts mass organosilicon compound (B) having 3 or more silicon atom-bonded hydrolyzable groups in 1 molecule, 0-15 parts mass condensation reaction catalyst (C), 100-400 parts mass heavy calcium carbonate (D) in which untreated heavy calcium carbonate or surface is processed from fatty acid or paraffin, and 1-200 parts mass light calcium carbonate (E) in which untreated light calcium carbonate or surface is processed with fatty acid.    USE - Room temperature-curing-type organopolysiloxane composition is used for forming sealant for construction, electric/electronic components, oil seal for motor vehicles (all claimed) and adhesive agent for solar cells in outdoors and building materials.    ADVANTAGE - The room temperature-curing-type organopolysiloxane composition is economical, and has reduced discoloration in hardened and unhardened state, and excellent design property.    DETAILED DESCRIPTION - A room temperature-curing-type organopolysiloxane composition comprises 100 parts mass linear organopolysiloxane (A) having viscosity of 20-1000000 mPa.second at 23 degrees C and whose molecular chain terminal is blocked by silanol group or silicon atom-bonded hydrolyzable group, 0.1-15 parts mass organosilicon compound (B) having 3 or more silicon atom-bonded hydrolyzable groups in 1 molecule, 0-15 parts mass condensation reaction catalyst (C), 100-400 parts mass heavy calcium carbonate (D) in which untreated heavy calcium carbonate or surface is processed from fatty acid or paraffin, 1-200 parts mass light calcium carbonate (E) in which untreated light calcium carbonate or surface is processed with fatty acid. At least one of the components (D) and (E) are surface-treated, and the sum total content of components (D) and (E) is 50.0-99.9 %mass. An INDEPENDENT CLAIM is included for electric/electronic component, which has a silicon rubber layer component obtained by hardening room temperature-curing-type organopolysiloxane composition.