Ferroelectric chiral smectic liquid crystal composition and liquid crystal device using same

A ferroelectric chiral smectic liquid crystal composition, comprising at least one compound represented by the following formula (I): wherein R1 and R2 respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent, at least one of R1 and R2 being optically active; and X1 denotes a single bond, and at least one compound represented by the following formula (II):wherein R3 and R4 respectively denote a linear or branched alkyl group having 1 - 18 carbon atoms capable of having a substituent; X2 and X3 respectively denote a single bond, -O-, and m and n are respectively 0, 1 or 2 with proviso that m + n = 2 or more.