A hinge device and a keyboard dock and a portable electronic device having the same are provided. The hinge device includes a first body and a second body. The first body is configured to be pivotally connected to a first object. One side of the second body is pivotally connected to the first body, and another side of the second body is configured to be pivotally connected to a second object. The first body rotates around a first axis relative to the first object. The second body rotates around a second axis relative to the first body. The second body rotates around a third axis relative to the second object. The first axis is perpendicular to the second axis, and the second axis is parallel to the third axis.