Stage apparatus

A stage apparatus, comprising:

• a main mounting table having a main base plate, wherein the main base plate is disposed at a top of the main mounting table;
• and
• a sub mounting table having a sub base plate, wherein the sub base plate is disposed at a top of the sub mounting table and is smaller than the main base plate,
• a main rail arranged on the main base plate of the main mounting table;
• and
• a sub rail, which is coupled to the main rail, disposed on the sub base plate of the sub mounting table,
• wherein the main base plate and sub base plate are detachably connected to each other, and surfaces of the main base plate and sub base plate are flat, and the surfaces of the main base plate and the sub base plate are disposed so as to be horizontal at the same height,
• wherein, on a rail of which the main rail and the sub rail are connected, a gantry is arranged or a movable mounting table of which an object to be processed is arranged thereon is provided,
• wherein the sub mounting table includes:
• a carriage having the sub base plate mounted thereon,
• wherein the carriage is provided with a plurality of transporting wheels, and
• an adjustment mechanism that changes a relative position between the carriage and the sub base plate.