A connecting device configured to rotatably connect a first main body and a second main body of an electronic apparatus includes a rotating mechanism rotatably connecting the first main body and the second main body. A coating mechanism covering at least a part of the rotating mechanism is provided and a supporting component is provide to support an inner side wall of the coating mechanism so that the coating mechanism is bent without folds or crumples as the rotating mechanism is rotated. The connecting device improves man-machine interaction and enables the user to enjoy a better experience.