A liquid chromatograph includes a liquid sending pump for sending a mobile phase, a sample injector that injects a sample into an analysis flow path through which a mobile phase from the liquid sending pump flows, a separation column that is provided on the analysis flow path and is to separate a sample that has been injected into the analysis flow path by the sample injector into components, a pressure sensor for detecting a liquid sending pressure in the analysis flow path located at a position farther upstream than the separation column, a damper capacity holder that holds an internal capacity of a system through which a mobile phase from the liquid sending pump flows as a damper capacity, a reference value determiner configured to determine a reference value of a fluctuation range of the liquid sending pressure when a liquid sending failure of the liquid sending pump occurs, using at least the damper capacity held by the damper capacity holder, and a liquid sending failure detector that is configured to periodically acquire a liquid sending pressure detected by the pressure sensor, obtain a fluctuation range of the liquid sending pressure in a certain driving period of the liquid sending pump and detect a liquid sending failure using the obtained fluctuation range and the reference value determined by the reference value determiner.