A method for designing a pair of progressive addition lenses , which is the method for designing a pair of spectacle lenses including a lens for a right eye and a lens for a left eye corresponding to right and left eyes respectively, comprising: setting a virtual object surface in a visual field viewed through the lens for a left eye and the lens for a right eye, wherein, when the virtual object surface is viewed from the eyeball side of the lens wearer, the point on the virtual object surface gradually approaches from the distance vision zone corresponding to the infinite distance to the near vision zone in the lower side, and the point on the virtual object surface becomes a distant point gradually as it goes away in right and left direction; calculating accommodation powers required for each right and left eyes respectively when an arbitrary point on the previously set virtual object surface is watched binocularly through each lens for each eye, based on the distance between that arbitrary point on a virtual object surface and each of the right and left eyes, and the lens power at each passing point where the optical ray from that arbitrary point towards the eye passes through; and correcting the lens power in at least one of the lens for a left eye and the lens for a right eye so that the calculated accommodation powers coincide with each other between right and left eyes, such that regarding all corresponding points in at least a range of upper side 10 mm to lower side 15 mm from at least a lens concealed mark position , and in a range of right and left 10 mm from a corridor , a difference between the accommodation powers required for each of the right and left eyes, is 0.05D or less; wherein the accommodation power is defined as follows in a backside vertex of the spherical surface: accomodation power = object distance reciprocal − average addition power at passing point . setting a virtual object surface in a visual field viewed through the lens for a left eye and the lens for a right eye, wherein, when the virtual object surface is viewed from the eyeball side of the lens wearer, the point on the virtual object surface gradually approaches from the distance vision zone corresponding to the infinite distance to the near vision zone in the lower side, and the point on the virtual object surface becomes a distant point gradually as it goes away in right and left direction; calculating accommodation powers required for each right and left eyes respectively when an arbitrary point on the previously set virtual object surface is watched binocularly through each lens for each eye, based on the distance between that arbitrary point on a virtual object surface and each of the right and left eyes, and the lens power at each passing point where the optical ray from that arbitrary point towards the eye passes through; and correcting the lens power in at least one of the lens for a left eye and the lens for a right eye so that the calculated accommodation powers coincide with each other between right and left eyes, such that regarding all corresponding points in at least a range of upper side 10 mm to lower side 15 mm from at least a lens concealed mark position , and in a range of right and left 10 mm from a corridor , a difference between the accommodation powers required for each of the right and left eyes, is 0.05D or less; wherein the accommodation power is defined as follows in a backside vertex of the spherical surface: accomodation power = object distance reciprocal − average addition power at passing point . <EOS>