Reclining apparatus

A reclining apparatus comprising:

• a fixed plate in which a guide portion having a pair of mutually opposing guide walls is provided
• a shaft provided in the fixed plate so as to freely rotate around an axis in a horizontal direction;
• a rotary plate relatively rotating around the shaft with respect to the fixed plate and in which an internal gear is provided along a circular arc around the shaft;
• a slide gear having a leading end portion and trailing end portion, the slide gear received between respective guide walls of the guide portion and freely moving along the guide walls between a lock position at which the leading end portion engages with the internal gear and a lock canceling position moving apart from the internal gear;
• and
• a cam member having a front surface and a back surface, the cam member mounted to the shaft and rotated by the shaft, thereby pushing the trailing end portion of the slide gear and moving the slide gear to the lock position, and engaging with the slide gear so as to move the slide gear to the lock canceling position;
• wherein a flange portion protruding in overall the circumferential direction around the slide gear in a plan view is provided on a back surface of the slide gear, and opposite side surfaces of the flange portion is slidably in contact with the guide portion, and a front surface of the flange portion is slidably in contact with the back surface of the cam member.