An anti-rollover structure, applicable to the cot body, includes at least two fixing elements and at least two support elements. The fixing elements are adapted to be mounted on an outer bottom surface of the cot body. The support elements are rotatably disposed at the fixing elements respectively. When the support elements are on a support surface, the support elements are subjected to pressure from the cot body and thereby rotated to protrude protruded from the cot body. A carrying device and a baby carrier are further introduced. The carrying device and the baby carrier each have the anti-rollover structure.