Roundness measuring apparatus

摘要

A roundness measuring apparatus includes a stylus stocker 50 and a controller 60. The stylus stocker 50 stores plural types of styli prepared corresponding to shapes of measurement sites of a measurement target object. The stylus stocker 50 can store styli in such a manner that each stylus can be held thereon and taken out thereof. The stylus stocker 50 is provided outside a measurement region, which is determined on the basis of the operation range of a turning table 20 and a detector driving mechanism 40. The detector driving mechanism 40 can move the detector 30 to the outside of the measurement region. When a measurement command is given, the controller 60 carries out roundness measurement of the object while controlling the turning table 20 and the detector driving mechanism 40. When a stylus replacement command is given, the controller 60 carries out stylus replacement operation between a detector main unit 32 and the stylus stocker 50 while controlling the detector driving mechanism 40.