A computer-implemented eyeglass lens design method comprising: a step of setting an optical system using a coordinate system, for which an origin is placed at a midpoint of centers of rotations (1L, 1R) of both eyeballs, and in which an object is specified by a visual direction from the origin, the optical system including the object, left and right eyeglass lenses (11L, 11R), and the both eyeballs (10L, 10R); a step of calculating a reference value of an angle of convergence with lines of fixations for which a fixation point of the object is set as a viewing direction, the fixation point being an intersection point at which the lines of fixations cross with each other, after passing through design reference points of the left and right eyeglass lenses (11L, 11R); a step of calculating an angle of convergence with lines of fixations, the lines of fixations extending to an object evaluation point in an arbitrary viewing angle and passing through the left and right eyeglass lenses (11L, 11R), and calculating a convergence aberration from a difference between the angle of convergence and the reference value of the angle of convergence; and a step of determining a lens shape by performing (S4-S7) an optimization so that a value of the convergence aberration is a minimum and is within predetermined threshold values, wherein a fusion is possible within the predetermined threshold values; wherein the fixation point of the object and the object evaluation point are set at positions on a hemisphere, a center of the hemisphere being at the origin, a radius of the hemisphere being a distance between an intersection point of lines of fixations and the origin, and the lines of fixation being from centers of rotations (1L, 1R) of left and right eyeballs and passing through the left and right design reference points, respectively. a step of setting an optical system using a coordinate system, for which an origin is placed at a midpoint of centers of rotations (1L, 1R) of both eyeballs, and in which an object is specified by a visual direction from the origin, the optical system including the object, left and right eyeglass lenses (11L, 11R), and the both eyeballs (10L, 10R); a step of calculating a reference value of an angle of convergence with lines of fixations for which a fixation point of the object is set as a viewing direction, the fixation point being an intersection point at which the lines of fixations cross with each other, after passing through design reference points of the left and right eyeglass lenses (11L, 11R); a step of calculating an angle of convergence with lines of fixations, the lines of fixations extending to an object evaluation point in an arbitrary viewing angle and passing through the left and right eyeglass lenses (11L, 11R), and calculating a convergence aberration from a difference between the angle of convergence and the reference value of the angle of convergence; and a step of determining a lens shape by performing (S4-S7) an optimization so that a value of the convergence aberration is a minimum and is within predetermined threshold values, wherein a fusion is possible within the predetermined threshold values; wherein the fixation point of the object and the object evaluation point are set at positions on a hemisphere, a center of the hemisphere being at the origin, a radius of the hemisphere being a distance between an intersection point of lines of fixations and the origin, and the lines of fixation being from centers of rotations (1L, 1R) of left and right eyeballs and passing through the left and right design reference points, respectively.