A handheld electronic device includes first, second and third bodies, a rod, and an elevating mechanism disposed on the first body. The rod has a first end, a second end, and a pivot portion pivotably mounted to the first body. The second body is slidably disposed on the first body and coupled to the first end. The second body is stacked between the first body and the third body. The third body is slidably disposed on the elevating mechanism and coupled to the rod. When the third body moves relative to the first body, the second body is driven by the first rod to move relative to the first body in an opposite direction, such that the second body is exposed out of the third body and the third body is descended by the elevating mechanism to move toward the first body.