REACTION VESSEL

PURPOSE:To simultaneously measure many items with respect to many specimens by providing a reaction unit having a passage provided with at least one fluid inlet and having at least one reagent fixing part on the way of the passage on the downstream side of the fluid inlet. CONSTITUTION:A specimen is introduced from a fluid inlet 10 and three kinds of the antigens in the specimen are respectively bonded to the antibodies corresponding to the antigens immobilized on reagent immobilized parts 30, 31, 32 and mutually having no cross reactivity. A solution mixture of three kinds of labelled antibodies is introduced from the fluid inlet 10 to bond the respective antigens bonded to the respective antibodies immobilized on the reagent immobilized parts 30, 31, 32 to the corresponding labelled antibodies and subsequently discharged from an outlet 20. If necessary, when the antibody corresponding to the substance to be measured in the specimen and the antibody corresponding to a reference substance are immobilized on the reagent immobilized parts 30, 31, 32 measuring the signals showing labels after cleaning, the substance to be measured and the reference substance can be simultaneously measured.