content of 50 by weight or less if this compound is added in a large amount the nematic phase lower limit temperature of the liquid crystal composition is elevated and the resistivity value is lowered the compound represented by formula 2 5 in the liquid crystal composition of the present invention has preferably a content of 20 by weight or less based on the whole weight of the composition if this compound has a large content the nematic phase lower limit temperature of the liquid crystal composition is elevated the synthetic processes of the compounds represented by formula 1 1 or 1 2 in the present invention for example the compounds represented by formulas 1 1 1 1 1 16 and 1 2 12 are described in japanese patent application laid open no 251186 1998 the synthetic processes of the compounds represented by formulas 2 1 3 2 2 1 or 2 2 4 are described in japanese patent application laid open no 233626 1990 the synthetic processes of the compounds represented by formula 2 4 1 are described in japanese patent application laid open no 141206 1997 as described above the compounds in the respective components constituting the composition of the present invention can be synthesized according to prior arts liquid crystal compounds other than the preceding compounds in the component a and the component b can be used for the liquid crystal composition of the present invention in a mixture as long as the object of the present invention is not damaged the liquid crystal composition according to the present invention is prepared by conventional processes in general employed is a process in which various compounds are mixed and dissolved each other at a high temperature in order to induce a helical structure of the.