The present invention provides a liquid chromatography device, and a liquid chromatography analysis method. The liquid chromatography device is capable of carrying out parallel processing for many kinds of liquid easily in high speed through employing a high pressure flow path and a low pressure flow path respectively through employing simple structure. The liquid chromatography device is capable of switching a liquid conveying channel which enable a column (60) to communicate with a main pump (63) which sends eluant A to the column to one of a first channel which enables the eluant A to flow from the main pump (63) to the column (60) and a second channel which enables eluant B to flow from a first sustaining flow channel to the column (60).