A steering device includes a handle unit; a steering connection piece; a joint connecting the handle unit to the steering connection piece; a steering connection rod movably connected to the steering connection piece; and a pair of steering rods each rotatably connected to the steering connection rod. In response to a rotation of the handle unit about a first rotational axis, the joint is configured to force the steering connection piece to rotate along with the handle unit about the first rotational axis to cause a shift of the steering connection rod along a first direction perpendicular to the first rotational axis, and the pair of steering rods is configured to rotate about second and third rotational axes, respectively, in response to the shift of the steering connection rod.