A method of automatically generating the cam data capable of realizing such a smooth cam profile that an acceleration at a designated point is zero without necessitating a special technique, comprising the steps of first obtaining an inclination at each designated point when an optimum cam profile is realized for each designated point by an automatic set value generating section (15), automatically obtaining, by using the inclination value and a preset equation, such a cam profile that the acceleration at the designated point is zero for each district between two designated start and endpoints, and lastly obtaining an entire cam profile by synthesizing the cam profiles obtained for each district.