PROBLEM TO BE SOLVED: To improve a rotation structure provided between a fixed frame and a movable frame of a bedside.SOLUTION: A frame rotation structure of a bedside comprises: a fixed member 2 provided with a lower cylindrical part a movable member 12 having an upper cylindrical part provided above the lower cylindrical part a pressing operation part 15 for lock release which is stored in the upper cylindrical part of the movable member while being biased upward and can be pushed down a rotary shaft part 16 fixed to the movable member and supported pivotally inside the lower cylindrical part and a lock member 18 which is provided with one engaging component 4 of engaging means formed along an inner peripheral wall at the upper part of the lower cylindrical part and engaged in a convexoconcave manner and the other engaging component 14 of the engaging means disposed below the rotary shaft part and formed on an outer peripheral wall, slides the pair of engaging components in a freely engageable and disengageable way in conjunction with the lifting of the pressing operation part, and rotates in conjunction with the rotary shaft part.
