To provide a device for manufacturing a spectacle lens, in which grooves, projections, etc., can be processed at high precision.

The device comprises a lens processing part to process a lens 100 that is to be the spectacle lens, and a detection part to detect the outer form and/or the size of the lens 100. The lens processing part comprises a tool 41 to form a groove on an edge surface of the lens 100, for example. The detection part comprises measurement elements 11 and 12 for measuring the outer form and the edge thickness of the lens 100, for example.