The invention relates to a headrest device and a movable chair with the headrest device. The headrest device is provided with a lower headrest connecting rod, an upper headrest connecting rod, a headrest fixing piece, a headrest positioning piece and a headrest arrangement plate, wherein the lower headrest connecting rod is rotatably connected with the upper headrest connecting rod; the lower endof the headrest fixing piece is fixed with the upper headrest connecting rod, and the other end of the headrest connecting piece is fixed with the headrest arrangement plate; and the headrest fixing piece is locally sleeved in the headrest positioning piece. The movable chair comprises a backrest component, a base component and the headrest device, wherein the headrest device, the backrest component and the base component are hinged. When the base component moves, the base component sequentially drives the backrest component and the headrest device to correspondingly change, namely along the movement of the movable chair, the headrest device can provide good support for the head all the time.