Patent ID: 8733184

Claim:
A position testing apparatus comprising: a stage on which a plate-like object is set; through holes formed through the stage and covered with the plate-like object set on the stage according to a positioning state; a flow measurement unit configured to draw air through the through hole from around the plate-like object and determine the positioning state of the plate-like object according to a flow rate of the drawn air; and a stop unit receiving the plate-like object set on the stage in a planar direction of the plate-like object so that the plate-like object is positioned at a target position, the stop unit comprising a pair of stop faces that are orthogonal to each other so as to receive the plate-like object thereagainst the stop faces, and the through holes being formed relative to the respective stop faces and defining openings on a surface of the stage onto which the plate-like object is placed and positioned, the openings being in contact with the respective stop faces in the planar direction of the plate-like object and protruding from the respective stop faces over the surface of stage so as to extend beyond the respective stop faces in the planar direction of the plate-like object.