LIQUID CHROMATOGRAPH

This liquid chromatograph (1) is provided with: a liquid feeding pump (14) for feeding a liquid as a mobile phase; a sample injection part (4) for injecting a sample into an analysis flow channel (12) through which the mobile phase from the liquid feeding pump (14) flows; a separation column (6) that is provided on the analysis flow channel (12) and that is for separating, into components, the sample injected by the sample injection part (4) into the analysis flow channel (12); a pressure sensor (16) for detecting the pressure of the liquid being fed, on the upstream side from the separation column (6), in the analysis flow channel (12); a damper capacity holding unit (22) for holding, as a damper capacity, the internal capacity of a system in which the mobile phase from the liquid feeding pump (14) flows; a reference value determination unit (24) configured to determine a reference value for the variation range of the pressure of the liquid being fed at a time when a liquid feeding failure has occurred in th