A portable electronic device includes a shell, an actuation member, a latching member, and a transmission member. The shell defines a first hole and a second hole which are linearly arranged with the first hole. The actuation member is received in the first hole and can be operated to move in the first hole. The latching member is partially received in the second hole and can move between a first position in which the latching member is spaced from a boundary of the second hole to allow a lanyard strap to be sleeved on the latching member and a second position in which the latching member contacts the boundary of the second hole to lock the lanyard strap to the shell. The transmission member is driven by the actuation member to move the latching member between the first position and the second position.