an apparatus for analyzing liquid specimen comprising a sampling valve consisting of two fixed elements , , and a movable element held between these fixed elements , sample aspiration means , diluent liquid dispensing means , and chamber for receiving diluent liquid and sample , which further comprises measuring item setting means , control means for selectively operating the dispensing means , and driving means for driving each dispensing means according to its control signal . by composing in this manner , in the apparatus for analyzing liquid specimen for aspirating and pushing liquid specimen such as blood in cylindrical shape by means of a sampling valve , taking out quantitatively , treating as required , and analyzing , only a sample necessary for measurement is selected , and is diluted or otherwise treated .