NOVELTY - A polycarbonate-type resin casing comprises 70-97 pts. wt. resin component (A component) consisting of polycarbonate-type resin and polycarbonate polydiorganosiloxane copolymer resin which has dihydric phenol in which copolymer resin is obtained by copolymerizing hydroxyallyl-terminated polydiorganosiloxane, and 3-30 pts. wt. titanium oxide (B component) surface-treated with organic substance in which average particle diameter of B component is 0.5-5 mu m, and solar reflectance of the near infrared region of resin casing obtained by molding the resin composition is greater than or equal to 80%.    USE - A polycarbonate-type resin casing for outdoor installations used for wireless base station of smart grid (all claimed) communication module, large-scale integration, CPU, solar cell module, power conditioner, watt-hour meter, smart meter, concentrator, public wireless local area network, electric vehicle charging device, surveillance camera, and outdoor unit of air-conditioner.    ADVANTAGE - Resin casing provides excellent thermal insulation.    DETAILED DESCRIPTION - A polycarbonate-type resin casing comprises 70-97 pts. wt. resin component (A component) consisting of polycarbonate-type resin and polycarbonate polydiorganosiloxane copolymer resin which has dihydric phenol of formula (1) in which copolymer resin is obtained by copolymerizing hydroxyallyl-terminated polydiorganosiloxane of formula (3), and 3-30 pts. wt. titanium oxide (B component) surface-treated with organic substance in which average particle diameter of B component is 0.5-5 mu m, and solar reflectance of the near infrared region of resin casing obtained by molding the resin composition is greater than or equal to 80%.    R1, R2=H, halo 1-18C alkyl, 1-18C alkoxy, 6-20C cycloalkyl, 6-20C cycloalkoxy, 2-10C alkenyl, 3-14C aryl, 3-14C aryloxy, 7-20C aralkyl, 7-20C aralkyloxy, NO2, aldehyde, CN, or COOH;    e, f=1-4;    W=single bond or formula (2);    R11-R18=H, 1-18C alkyl, 3-14C aryl, or 7-20C aralkyl;    R19, R20=H, halo, 1-18C alkyl, 1-10C alkoxy, 6-20C cycloalkyl, 6-20C cycloalkoxy, 2-10C alkenyl, 3-14C aryl, 6-10C aryloxy, 7-20C aralkyl, 7-20C aralkyloxy, NO2, aldehyde, CN, or COOH;    g=1-10;    h=4-7;    R3-R8=H, 1-12C alkyl, or optionally substituted 6-12C aryl;    R9, R10=H, halo, 1-10C alkyl, or 1-10C alkoxy;    p=natural number;    q=0 or natural number;    p+q= less than or equal to 300 natural number; and    X=2-8C bivalent aliphatic group.