Problem to be solved: to provide an electrolyte analyzing apparatus for inhibiting contamination by a different reagent reacting to the suction nozzle when the reagent is exchanged by the user.Electrolyte analyzerA suction nozzle 6 is coupled.A nozzle support 203 capable of moving between the reagent container exchange position and the reagent suction positionThe reagent container fitted with the nozzle support moved to the replacement positionA lock mechanism 301 for fixing the nozzle support part at a reagent container exchange position andWith power suppliedAn unlocking mechanism 302 capable of releasing the engagement between the nozzle support part and the lock mechanism is provided.When reagent container 101 meets predetermined conditionsThe lock release mechanism is controlled so as to cancel the engagement between the nozzle support portion and the lock mechanismThe nozzle support portion moves to the reagent suction position.
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