Sample injection apparatus and method, and a liquid chromatography apparatus having a sample injection device

The carryover can be sufficiently reduced, it has a cleaning means cleaning time is short in a simple, little influence of vibration caused by the washing means, less error in the injection amount of the sample is not to lower the durability of the sample needle , sample injector and a sample injection method, and to provide a liquid chromatography apparatus having a sample injection device. Sample container 14 in which the sample is supplied, the sample needle 10 for sucking and discharging a sample, cleaning unit 17 for cleaning liquid for cleaning at least the sample needle 10 is supplied, the sample discharged from the sample needle 10, moves sample injection unit 15 and the sample container 14 is injected into liquid, comprising a needle moving means for moving the sample needle 10 between the cleaning unit 17 and a sample injection unit 15, the cleaning unit 17, the washing liquid and sample injection apparatus having an ultrasonic transducer 21 to generate ultrasonic waves.