An immunoassay apparatus comprising: a sample dispenser part arranged to dispense a sample into a first reaction container; a reagent dispenser part arranged to dispense, into the first reaction container; a solid-phase reagent containing a solid-phase carrier; a labeled reagent containing a labeled substance; and a releasing reagent that releases, from the solid-phase carrier, an immune complex including a target substance included in the sample and the labeled substance; a BF separation part arranged to separate the solid-phase carrier on which an immune complex including the target substance and the labeled substance is formed, and a liquid component; a measurement part arranged to measure a signal based on the labeled substance included in the immune complex in a second reaction container; a container supply part arranged to store a plurality of reaction containers (70, 71) including the first reaction container and the second reaction container; a reaction-container holding part (50, 60, 310) including holding holes, each of which is configured to hold a reaction container; a transfer part (51, 52, 320) arranged to transfer the first reaction container and the second reaction container to the reaction container holding part (50, 60, 310) so that the immune complex dispensed from the first reaction container is dispensed into the second reaction container; and a controller arranged to control a test processing including: first solid phasing processing of binding the immune complex and a first solid-phase carrier; releasing processing of releasing the immune complex from the first solid-phase carrier; second solid phasing processing of binding the immune complex and a second solid-phase carrier; and measurement processing of measuring the signal. a sample dispenser part arranged to dispense a sample into a first reaction container; a reagent dispenser part arranged to dispense, into the first reaction container; a solid-phase reagent containing a solid-phase carrier; a labeled reagent containing a labeled substance; and a releasing reagent that releases, from the solid-phase carrier, an immune complex including a target substance included in the sample and the labeled substance; a BF separation part arranged to separate the solid-phase carrier on which an immune complex including the target substance and the labeled substance is formed, and a liquid component; a solid-phase reagent containing a solid-phase carrier; a labeled reagent containing a labeled substance; and a releasing reagent that releases, from the solid-phase carrier, an immune complex including a target substance included in the sample and the labeled substance; a BF separation part arranged to separate the solid-phase carrier on which an immune complex including the target substance and the labeled substance is formed, and a liquid component; a measurement part arranged to measure a signal based on the labeled substance included in the immune complex in a second reaction container; a container supply part arranged to store a plurality of reaction containers (70, 71) including the first reaction container and the second reaction container; a reaction-container holding part (50, 60, 310) including holding holes, each of which is configured to hold a reaction container; a transfer part (51, 52, 320) arranged to transfer the first reaction container and the second reaction container to the reaction container holding part (50, 60, 310) so that the immune complex dispensed from the first reaction container is dispensed into the second reaction container; and a controller arranged to control a test processing including: first solid phasing processing of binding the immune complex and a first solid-phase carrier; releasing processing of releasing the immune complex from the first solid-phase carrier; second solid phasing processing of binding the immune complex and a second solid-phase carrier; and measurement processing of measuring the signal. first solid phasing processing of binding the immune complex and a first solid-phase carrier; releasing processing of releasing the immune complex from the first solid-phase carrier; second solid phasing processing of binding the immune complex and a second solid-phase carrier; and measurement processing of measuring the signal.