Abstract: An immunological analyzing reagent comprising a composition containing a biotin-conjugated antigen or antibody against a substance to be analyzed, and a composition containing an avidin-conjugated microparticle, wherein the biotin-conjugated antigen or antibody contains an amount of biotin which does not substantially agglutinate with the avidin-conjugated microparticle in the absence of the substance to be analyzed, is disclosed.

Abstract: A card cassette includes a card containing chamber, and a card feeding roller located on the wall of at least one side of the card containing chamber. When the cassette is inserted into a cassette mount or a cassette receiving recess of a mating device, the roller rolls on the inner wall of the cassette receiving recess of the device as the cassette is further pushed inward, thereby automatically delivering the card within the card containing chamber into a card processing station of the device. When the card cassette is withdrawn from the cassette receiving recess of the device, the roller rolls in the reverse direction, thereby automatically restoring the card into the chamber.