Processing device

A processing device comprising:

• three linear guides disposed at positions corresponding to three vertices of a triangle in plan view as viewed from a direction parallel to a first direction;
• a processing unit supported by the linear guides to lift and lower in the first direction;
• a feed mechanism that lifts and lowers the processing unit in the first direction;
• and
• a holding mechanism that holds a processing object below the processing unit, wherein
• the processing unit supports a grindstone such that the grindstone faces the processing object held by the holding mechanism and includes a spindle unit that rotates the grindstone around a rotation center parallel to the first direction,
• a centroid of the processing unit is located inside the triangle in plan view, and
• when the grindstone is rotated around the rotation center, the grindstone passes through a position not overlapping a centroid of the triangle and passes through a position deviated from the centroid of the triangle toward a location where a force in a lifting and lowering direction is applied to the processing unit by the feed mechanism.