A spectacle lens measuring and machining device, comprising: a distance measuring device for measuring a distance between a frame center forming a block center in an edging for manufacturing the spectacle lens from a raw material lens and the edge face of said spectacle lens, including an error (α,β) produced in said edging; a lens thickness measuring device for measuring the lens thickness at a mounting part-machined portion in the spectacle lens where the mounting part for mounting spectacle frame components is machined; a lens feeder for feeding the spectacle lens to the lens thickness measuring device; a machining device (90,110) including a machining tool which advances from the edge face of said spectacle lens toward the inside of the lens, and for machining said mounting part to said spectacle lens with the machining tool; a controller for controlling said lens feeder and said machining device, to control feeding of said spectacle lens to said lens thickness measuring device by said lens feeder based on data on said distance which is inputted from said distance measuring device, and not to drive said machining device when data on said lens thickness is inputted from said lens thickness measuring device and the lens thickness found to be less than the specified value, and to drive the machining device when the lens thickness is equal to or larger than the specified value, wherein the feeding of the spectacle lens to the lens thickness measuring device using the lens feeder under control of the above-described control device is performed based on the deviation amount (α,β) of the actual frame center (FC') from the designed frame center, which is calculated based on the measured results of the above-described distance measuring device. a distance measuring device for measuring a distance between a frame center forming a block center in an edging for manufacturing the spectacle lens from a raw material lens and the edge face of said spectacle lens, including an error (α,β) produced in said edging; a lens thickness measuring device for measuring the lens thickness at a mounting part-machined portion in the spectacle lens where the mounting part for mounting spectacle frame components is machined; a lens feeder for feeding the spectacle lens to the lens thickness measuring device; a machining device (90,110) including a machining tool which advances from the edge face of said spectacle lens toward the inside of the lens, and for machining said mounting part to said spectacle lens with the machining tool; a controller for controlling said lens feeder and said machining device, to control feeding of said spectacle lens to said lens thickness measuring device by said lens feeder based on data on said distance which is inputted from said distance measuring device, and not to drive said machining device when data on said lens thickness is inputted from said lens thickness measuring device and the lens thickness found to be less than the specified value, and to drive the machining device when the lens thickness is equal to or larger than the specified value, wherein the feeding of the spectacle lens to the lens thickness measuring device using the lens feeder under control of the above-described control device is performed based on the deviation amount (α,β) of the actual frame center (FC') from the designed frame center, which is calculated based on the measured results of the above-described distance measuring device.