A liquid-crystalline polyester blend composition includes 100 parts by weight of a liquid-crystalline polyester blend and 0.1-300 parts by weight of calcium titanate and/or barium titanate, wherein the liquid-crystalline polyester blend can be obtained by combining liquid-crystalline polyester (A) (LCP A) and liquid-crystalline polyester (B) (LCP B) such that the ratio by weight of (LCP A)/(LCP B) is 99/1 to 80/20, wherein LCP A and LCP B are as defined in the specification, provided that at least one of LCP A and LCP B includes one or two repeating units that come from corresponding minor copolymerizing components selected from aromatic diol, aromatic dicarboxylic acid, aromatic monocarboxylic acid and aromatic monohydroxy compound.