A lens spherical surface grinding method using a dish-shaped grindstone in which a dish-shaped grindstone provided with a spherical grindstone surface provided with diamond abrasive grains is pressed at a predetermined pressure against a surface-to-be-ground of a grinding target lens blank, and in such a state, the surface-to-be-ground is ground on a spherical surface while the dish-shaped grindstone is rotated and swung at a predetermined rotational speed, the method characterized in comprising: an initial-stage grinding process for performing grinding in which the processing pressure is a first processing pressure and the rotational speed is a first rotational speed; an intermediate-stage grinding process for performing grinding in which the processing pressure is a second processing pressure and the rotational speed is a second rotational speed; and a last-stage grinding process for performing grinding in which the processing pressure is a third processing pressure and the rotational speed is a third rotational speed, wherein the second processing pressure is a pressure at which the spherical grindstone surface can bite into the lens blank, a biting amount of the dish-shaped grindstone is obtained from a hardness of the lens blank and a contact area between the surface-to-be-ground of the lens blank and the spherical grindstone surface of the dish-shaped grindstone, and the second processing pressure is calculated on the basis of the biting amount; the second rotational speed is set to a rotational speed at which the diamond abrasive grains of the dish-shaped grindstone can bite into the lens blank; the first processing pressure is set to a value less than the second processing pressure and the first rotational speed is set to a value less than the second rotational speed; and the third processing pressure is set to a value less than the first processing pressure and the third rotational speed is set to a value less than the second rotational speed and greater than the first rotational speed. an initial-stage grinding process for performing grinding in which the processing pressure is a first processing pressure and the rotational speed is a first rotational speed; an intermediate-stage grinding process for performing grinding in which the processing pressure is a second processing pressure and the rotational speed is a second rotational speed; and a last-stage grinding process for performing grinding in which the processing pressure is a third processing pressure and the rotational speed is a third rotational speed, wherein the second processing pressure is a pressure at which the spherical grindstone surface can bite into the lens blank, a biting amount of the dish-shaped grindstone is obtained from a hardness of the lens blank and a contact area between the surface-to-be-ground of the lens blank and the spherical grindstone surface of the dish-shaped grindstone, and the second processing pressure is calculated on the basis of the biting amount; the second rotational speed is set to a rotational speed at which the diamond abrasive grains of the dish-shaped grindstone can bite into the lens blank; the first processing pressure is set to a value less than the second processing pressure and the first rotational speed is set to a value less than the second rotational speed; and the third processing pressure is set to a value less than the first processing pressure and the third rotational speed is set to a value less than the second rotational speed and greater than the first rotational speed.