Provided is an optical characteristic measuring method for measuring the optical characteristics of an optical system to form the image of an object arranged on a first surface, on a second surface. A first region for a measuring light to pass therethrough or to be reflected thereon is arranged (at S20) in the first surface. A second region for the measuring light to pass therethrough or to be reflected thereon is arranged (at S21) at a position lying in the second surface and corresponding to the first region.The quantities of the measuring light through either the first region or the second region and the optical system are detected (at S23 and S24) through the other of the first region and the second region. At least one of the first region and the second region is so shaped that the quantity of the measuring light to pass through or to be reflected on the optical system changes according to those optical characteristics.
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