A method for designing progressive power spectacle lenses, the method comprising: an evaluation-value calculating step of preparing a plurality of to-be-evaluated progressive power lenses (B-D, E, J-L) having different lens surface designs, thereafter measuring predetermined biological information of a subject for each of the to-be-evaluated progressive power lenses (B-D, E, J-L) by allowing the subject to wear each of the to-be-evaluated progressive power lenses (B-D, E, J-L), and, based on said measured predetermined biological information, calculating an evaluation value of each of the to-be-evaluated progressive power lenses (B-D, E, J-L) with respect to a predetermined index; and a lens-surface-shape determining step of calculating a correlation between an evaluation value of each of the to-be-evaluated progressive power lenses (B-D, E, J-L) calculated in the evaluation-value calculating step and a lens surface shape of each of the to-be-evaluated progressive power lenses (B-D, E, J-L) as an index characteristic, and, based on the index characteristic, determining a new lens surface shape of a progressive power spectacle lens appropriate according to said predetermined index, wherein the predetermined index is a criterion for judging the state of a sensation felt when viewing through the lens is performed, and wherein the biological information is one selected from brainwaves, amount of oxygenated hemoglobin in the brain blood, amount of deoxygenated hemoglobin in the brain blood, amount of all hemoglobin in the brain blood, myoelectric potential, blink, body temperature, heart rate, blood pressure, perspiration function, and salivary components. an evaluation-value calculating step of preparing a plurality of to-be-evaluated progressive power lenses (B-D, E, J-L) having different lens surface designs, thereafter measuring predetermined biological information of a subject for each of the to-be-evaluated progressive power lenses (B-D, E, J-L) by allowing the subject to wear each of the to-be-evaluated progressive power lenses (B-D, E, J-L), and, based on said measured predetermined biological information, calculating an evaluation value of each of the to-be-evaluated progressive power lenses (B-D, E, J-L) with respect to a predetermined index; and a lens-surface-shape determining step of calculating a correlation between an evaluation value of each of the to-be-evaluated progressive power lenses (B-D, E, J-L) calculated in the evaluation-value calculating step and a lens surface shape of each of the to-be-evaluated progressive power lenses (B-D, E, J-L) as an index characteristic, and, based on the index characteristic, determining a new lens surface shape of a progressive power spectacle lens appropriate according to said predetermined index, wherein the predetermined index is a criterion for judging the state of a sensation felt when viewing through the lens is performed, and wherein the biological information is one selected from brainwaves, amount of oxygenated hemoglobin in the brain blood, amount of deoxygenated hemoglobin in the brain blood, amount of all hemoglobin in the brain blood, myoelectric potential, blink, body temperature, heart rate, blood pressure, perspiration function, and salivary components.