An analyzing device for liquid chromatography comprising: a feeder that is connectable to a container in which a sample is contained, the feeder being configured to suck the sample from the container and to feed the sample when the container is connected to the feeder; a measurer for receiving the sample from the feeder; and a controller for performing control for feeding the sample from the feeder to the measurer; wherein the measurer includes a column containing a filler, a detector, and an injection valve capable of introducing a predetermined amount of the sample into the column for measurement and also capable of feeding a mobile phase into the column, the measurer being configured so that the sample adsorbed to the filler is desorbed by the mobile phase and an effluent thereby produced is subjected to measurement by the detector for obtaining measurement results; the feeder includes a tubular portion capable of retaining therein an amount of the sample necessary for two or more times of measurement and the tubular portion is configured to feed the sample to the injection valve; characterized in that the controller is configured to perform an accuracy check by: controlling the feeder, when a sample of known concentration is contained in the container, to suck the sample of known concentration from the container into the tubular portion, and to feed a part of the sample from the tubular portion to the measurer; controlling the measurer to obtain measurement results of the sample and checking whether the measurement results correspond with the known concentration; after said measurement of the sample of known concentration, controlling the feeder to feed at least a part of the remaining sample from the tubular portion to the measurer for further measurement of the sample of known concentration, without sucking further sample from the container into the feeder; and controlling the measurer to obtain further measurement results of the sample and checking whether the further measurement results correspond with the known concentration. a feeder that is connectable to a container in which a sample is contained, the feeder being configured to suck the sample from the container and to feed the sample when the container is connected to the feeder; a measurer for receiving the sample from the feeder; and a controller for performing control for feeding the sample from the feeder to the measurer; wherein the measurer includes a column containing a filler, a detector, and an injection valve capable of introducing a predetermined amount of the sample into the column for measurement and also capable of feeding a mobile phase into the column, the measurer being configured so that the sample adsorbed to the filler is desorbed by the mobile phase and an effluent thereby produced is subjected to measurement by the detector for obtaining measurement results; the feeder includes a tubular portion capable of retaining therein an amount of the sample necessary for two or more times of measurement and the tubular portion is configured to feed the sample to the injection valve; characterized in that the controller is configured to perform an accuracy check by: controlling the feeder, when a sample of known concentration is contained in the container, to suck the sample of known concentration from the container into the tubular portion, and to feed a part of the sample from the tubular portion to the measurer; controlling the measurer to obtain measurement results of the sample and checking whether the measurement results correspond with the known concentration; after said measurement of the sample of known concentration, controlling the feeder to feed at least a part of the remaining sample from the tubular portion to the measurer for further measurement of the sample of known concentration, without sucking further sample from the container into the feeder; and controlling the measurer to obtain further measurement results of the sample and checking whether the further measurement results correspond with the known concentration. controlling the feeder, when a sample of known concentration is contained in the container, to suck the sample of known concentration from the container into the tubular portion, and to feed a part of the sample from the tubular portion to the measurer; controlling the measurer to obtain measurement results of the sample and checking whether the measurement results correspond with the known concentration; after said measurement of the sample of known concentration, controlling the feeder to feed at least a part of the remaining sample from the tubular portion to the measurer for further measurement of the sample of known concentration, without sucking further sample from the container into the feeder; and controlling the measurer to obtain further measurement results of the sample and checking whether the further measurement results correspond with the known concentration.