A portable electronic device includes a main body, a number of ball bearings, a spherical retaining member and a camera module. The main body includes a cavity formed therein, and a number of recesses formed in inner walls of the cavity and in communication with the cavity. The ball bearings are received in the respective recesses. The spherical retaining member is located in the cavity and is in contact with the ball bearings. The spherical retaining member defines a receiving space therein and an opening in communication with the receiving space. The camera module is received in the receiving space and facing the opening, the camera module is retained by the spherical retaining member in a manner such that the camera module is rotated by rotating the spherical retaining member relative to the ball bearings.