An electronic storage device for connecting with a host system in accordance with the present invention includes a frame defining a receiving cavity, a main body rotatably received in the receiving cavity of the frame and including an electrical connector with an interface and a pivoting portion cooperating with the frame to realize the rotation of the main body. At least one of the frame and the main body forms a number of elastic pieces protruding into the receiving cavity. At least one of the main body and the frame defines a receiving space surrounded by a number of cooperating edges curved inwardly, and a number of recesses formed at the cross of each adjacent two cooperating edges. At a first position, the elastic pieces are respectively received in the recesses. As the main body is actuated to rotate, each elastic piece is actuated by the cooperating edge to produce deformation and slide along the curved cooperating edge and located in a neighboring recess with the main body rotating to a second position.