Disclosed is a method of measuring aberration of a projection optical system, wherein an image of a test pattern is formed through the projection optical system, and a positional deviation amount of the image of the test pattern is measured and then aberration of the projection optical system on the basis of the positional deviation amount. The produced toothed section is reworked on the peripheral face by means of at least one second tool in the region of the first end face, while the toothed section is further produced. \u2018X\u2019 being the price that the customer and the hedging company agree to. First, perform a shmoo test on the static random access memory to obtain a shmoo test plot and a minimum operating voltage. The main body is provided with a plurality of securing holes. A power supply to the vehicle-stop-state detecting device is made stop if the ignition switch is turned to the OFF state from an ON state, and the power supply to the vehicle-stop-state detecting device resumes if there occurs the change in the state of the vehicle door detected by the door-state detecting device when the ignition switch is in the OFF state.