PROBLEM TO BE SOLVED: To provide a designing method of a spectacle lens capable of objectively evaluating sensations of individual users to reflect the evaluation to lens designing.SOLUTION: In a reference evaluation value calculation process, first visual content is visually observed by a plurality of subjects, and in this process, brain waves are measured and a reference evaluation value is calculated from the measurement results. In a specific evaluation value calculation process, the first visual content is visually observed by a wearer similarly, and brain waves are measured and a specific evaluation value is calculated from the measurement result. In a specific sensation value calculation process, a specific sensation value is calculated based on the reference evaluation value and the specific evaluation value. In a lens shape decision process, a shape correction is given to a base design, wherein an association relationship with the reference evaluation value is set previously, based on the specific sensation value, and a suitable lens shape of a spectacle lens relating to an index, for example, "easiness of accustoming to vibrations" in a wearing subject is decided.
