Processing device

A processing device that performs rough grinding, medium grinding and fine grinding on a work in order, the processing device comprising:

• an index table that includes a plurality of chucks for adsorbing and holding the work, and transports the work in order of a rough grinding stage provided with a rough grinding means for rough grinding the work, a medium grinding stage provided with a medium grinding means for medium grinding the work, and a fine grinding stage provided with a fine grinding means for fine grinding the work;
• a first column provided to extend over the index table and in which one of the rough grinding means or the fine grinding means is installed;
• and
• a second column provided to extend over the index table and provided independent from the first column, and in which the medium grinding means is installed and the other one of the rough grinding means or the fine grinding means is arranged parallel to the medium grinding means.