To obtain the subject medium having a wide nematic phase range and a low viscosity and useful for a liquid crystal display, etc., by providing a liquid crystal component, etc., and a specific clearing point and a specified cross-over frequency.

This medium comprises (A) a dielectrically negative component, (B) a dielectrically positive component containing an ester compound and (C) a selectively dielectrically neutral component and has ≥-80°C clearing point and ≥-25 kHz crossover frequency. Furthermore, the component A preferably contains one or more compounds represented by formula I (R11 and R12 are each a 1-7C alkyl, a 1-7C alkoxy, a 2-7C alkenyl or the like; formula II is trans-1,4-cyclohexylene or 1,4-phenylene; Z1 is CH2CH2, COO or the like; n is 0 or 1).