To provide the element and device for parallel optical logical operation which has such functionality that multiple bidirectional writing of image information multiple operation are possible and image information can be replaced in laminate structure, and can speedily perform basic logical operation for copying flexibly with algorithm.

Three liquid crystal cells 1 which are charged with ferroelectric liquid crystal are put one over another so that their pixels correspond to one another, and polarizers are arranged across one or two liquid crystal cells 1 so that their polarization directions are parallel to each other. Further, the cell thickness of the liquid crystal cells 1 is suppressed so that a transmitted light spectrum has a waveform distribution enabling logical operation.