Abstract: A rotating mechanism and a housing case are provided. The rotating mechanism includes a connection panel, a mounting base, and a rotating shaft. The connection panel has a first position and a second position. The mounting base includes a base body and protruding portions extending out of either side of the base body. The base body has a second notch. The second notch is arranged between the two protruding portions. Each protruding portion forms an accommodation slot opened toward the outer side of the base body. When the connection panel is in the first position, a portion of the connection panel is in the inner side of the base body, and when the connection panel is in the second notch, the portion of the connecting panel is arranged in the notch and closes the notch.