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.

Abstract: Embodiments of the present application provide a bistable hinge for an earphone charging case and the earphone charging case. The bistable hinge includes an installation base, a connecting member, and an elastic member. The connecting member is rotatably connected to the installation base, the connecting member has a rotating axis, and the connecting member has a first stable position, a critical position, and a second stable position, the critical position being between the first stable position and the second stable position. The elastic piece is loaded between the installation base and the connecting member. When the connecting member is offset from the critical position at either side along the rotating direction, the elastic piece exerts a drive torque on the connecting member so as to drive the connecting member to move to the first stable position or the second stable position.