A rotary cam apparatus including an operation member including a contact portion is provided. The rotary cam includes a cam profile contacting the contact portion to move the operation member, and an elastic member applying an elastic force to the operation member in a direction in which the contact portion contacts the cam profile. The cam profile includes a first cam line separated by a first distance from a rotating center of the rotary cam, a second cam line separated by a shorter second distance from the rotating center, a first conversion line connected to the first cam line from the second cam line, and a second conversion line connected to the second cam line from the first cam line including one or more straight connection lines separated by a distance greater than the second distance and less than the first distance from the rotating center.