To cut a nozzle easily and accurately in order to secure the reliability of data by fixing a nozzle of a nozzle set onto a sliding base, and providing a nozzle fixing plate having an angle-length adjustable nozzle cutting part.

A sliding base 20 is placed on the upper face flat part of a base 50, and a sliding base stopper plate 60 is fitted. An adjusting shaft 70 is inserted through a through hole 20a of the sliding base 20 and screwed with the base 50, and sliding base guide plates 80a, 80b are fitted to both side faces of the base 50. A nozzle set 10 removed from an automatic sampler arm is inserted through a through hole 50a, and a tip tube part including a nozzle 1 is placed on the upper face center part of the sliding base 20, held by a nozzle fixing plate 30 and fixed by fixing screws 40a, 40b. The sliding base 20 slides in a space formed by the guide plates 80a, 80b on the upper face of the base 50 until it is stopped by the sliding base stopper plate 60, and the tip part of the pulled-out nozzle 1 is cut to a requested angle by a nozzle cutting part 90.