Abstract: Provided are a method of detecting a target with high accuracy, a method of suppressing an increase in background, and a detection apparatus. A first target-binding substance that is immobilized at a carrier and is capable of binding to a target and a second target-binding substance that supports a labeling substance and is capable of binding to the target are used. By reacting a sample, the first target-binding substance, and the second target-binding substance, a complex of the target in the sample, the first target-binding substance, and the second target-binding substance is formed in a first container. Subsequently, after the complex is transferred from the first container to a second container, the complex is detected by detecting the labeling substance in the second container.

Abstract: The present invention relates to a method for stabilizing a labeled antibody in a solution, in which the labeled antibody is stabilized by allowing the labeled antibody to be present together with at least one of amino acid and a derivative thereof in the solution.