Provided is a method for measuring amyloid precursor protein (APP) cleavage peptides including amyloid beta (Aβ) peptides. A method for measuring APP cleavage peptides in a blood sample includes the steps of: bringing a blood sample into contact with an antibody-immobilizing carrier in a binding solution to bind the antibody-immobilizing carrier and APP cleavage peptides contained in the blood sample, the antibody-immobilizing carrier including a carrier, and an antibody bound to the carrier and selected from the group consisting of an immunoglobulin having an antigen binding site capable of recognizing APP cleavage peptides and an immunoglobulin fragment containing an antigen binding site capable of recognizing APP cleavage peptides; washing a bound body of the antibody-immobilizing carrier and the APP cleavage peptides using a washing solution; dissociating the APP cleavage peptides from the antibody-immobilizing carrier using an acidic aqueous solution containing an organic solvent; and detecting the dissociated APP cleavage peptides.