. "In the above described general formulae (I), (II) and (III), R1, R2, R3, R4, R5 and R6 each are a substituent selected from the group consisting of the following groups A, B and C, wherein in a liquid crystal material described in 1), 2), 4) and 5), there is included at least one kind of discotic liquid crystal expressed by the general formulae (I), (II) and (III), which has one kind or a pluralit" . . . . . . .