An eyeglass lens processing system includes: input means for inputting frame shape data and layout data; grinding means having holding means for sucking and holding the subject lens at one end of a rotating shaft for nipping and rotating the subject lens, for grinding the subject lens by a grinding wheel; lens conveying means for holding the subject lens placed at a predetermined position and conveying the subject lens to an intended position; amount-of-eccentricity measuring means for detecting a position of an optical center of the subject lens held by the lens conveying means and for obtaining an amount of eccentricity of the optical center of the subject lens with respect to a predetermined reference position; and calculating means for obtaining processing data for the sucked and held subject lens by causing the reference position and the center of the rotating shaft to be aligned with each other by the lens conveying means, on the basis of data on the frame shape, the layout data, and the amount of eccentricity.