Abstract: A reagent kit for measuring an HCV antibody is described herein. This reagent comprises a first and second reagents. The first reagent comprises an HCV synthetic peptide antigen which has a solid phase binding site. The second reagent comprises a solid phase. On the solid phase is immobilized a binding substance and/or an HCV recombinant HCV antigen. The binding substance can bind to the solid phase binding site. The method for measuring an HCV antibody in a sample is also described. This method comprises a step for contacting the sample, the first reagent and the second reagent, and a step for detecting a complex comprising the antigen and antibody.