SEAT HEADREST AND VEHICLE SEAT

The present invention relates to a seat headrest device comprising a fixed base (), a headrest () and a headrest electric motor (). The headrest electric motor () drives the headrest () to move relative to the fixed base () through a composite motion mechanism comprising a screw-nut mechanism () and a pinion-rack mechanism (). The present invention further discloses a seat headrest device comprising the seat headrest device. The seat headrest device has the following characteristics: a stroke of the headrest can be significantly enhanced by means of the composite movement mechanism.