Abstract: A rotary connection apparatus comprising a bottom bracket, a top bracket rotatably connected to the bottom bracket, an annular spacer and a plurality of balls. The spacer and the balls are received between the bottom bracket and the top bracket. A thickness of the spacer is less than a diameter of the balls, and the spacer includes a plurality of holding holes, each holding hole has two openings exposed at opposite surfaces of the spacer, and a diameter of each of the openings is less than that of the balls, and a diameter of a central portion of each holding hole is equal to the diameter of the balls; each of the holding holes accommodates one corresponding ball, and each ball has opposite end portions protruding out of the spacer. A spacer is also provided.