Headrest height adjusting device

The utility model discloses a headrest height adjusting device, which comprises a backrest and a headrest. The back side of the backrest is equipped with a longitudinal slide rail and the slide rail is provided with a plurality of clamping holes. The headrest is extended downward with a slide member slidebaly matched with the slide rail. The slide member is provided with an elastic arm and a driving member abutting against the elastic arm. The elastic arm is provided with a fastening projection for being engaged with the plurality of clamping holes, so that the elastic deformation of the elastic arm is realized through operating the driving member. Therefore, the fastening projection is clamped in or disengaged from any one of the clamping holes, so that the headrest can be clamped at different positions of the backrest. The headrest height adjusting device has the advantages of simple structure and easy and convenient operation Due to the adoption of the headrest height adjusting device, the headrest can be adjusted so as to be clamped at different positions of the backrest, thereby meeting the use requirements of children of different heights.