A portable electronic device is provided. The portable electronic device includes a display unit, an input unit and a hinge member. The hinge member is detachably connected to the display unit and pivotally connected to the input unit, and the hinge member and the display unit are rotatable relative to the input unit around a rotary axis. The display unit has at least a slot and the hinge member has at least a guide pin corresponding to the slot. The guide pin has a first slope structure and a vertical surface structure. The first slope structure and the vertical surface structure are arranged in a direction parallel to the rotary axis.