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In general， automotive engines are required to have high safety and reliability ． Camshaft is a particularly important component for controlling exhaust gas of a combustjen engine ， determining the perfbrmance of the engine ． Th ロ s the shape ofthe cam surface has been finished to a high − precision ， It is important to examine the cam track surface condition ， However ， since the cam surface is the complex shape ， there is almost no method to observe the cam surface ， Therefore ， 山 evisual inspections of the camshafts have been carried out by experts ． However ， traceability is not guaranteed because the observation image cannot be taken ． It is difficult to observe the shape of the cam surface using conventional optical 血 croscope ． These microscopes take too much time to observe the surface because their field of view is not so wide ， In this study ， we developed a new method of observing the whole cam surface using the laser microscope having a wide field of view ． To view the observation image ， a three − dimensiona1 yiew program was created using DirectX． It is easy to find out the flaw positions using this program ．

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