A hinge device and a keyboard dock and a portable electronic device having the same are provided. The hinge device includes a body, a torsion generating part, a rotating part and a second wedging unit. The torsion generating part is pivotally connected to the body and has a first wedging unit. The rotating part is pivotally connected to the body. The second wedging unit is assembled to the rotating part and moved along with the rotating part. The first wedging unit and the second wedging unit are wedged together or separated from each other while the rotating part rotates relative to the body along a first axis. The body can rotate along a second axis relative to the torsion generating part while the first wedging unit and the second wedging unit are separated from each other. The first axis is vertical to the second axis.