Abstract: The present invention relates to a neck muscle exercise device includes: a main body part; a chair part provided at the main body part, having a seat part for supporting the buttocks of a user such that the user sits thereon, and formed such that the height of the seat part can be adjusted by an electric cylinder; and push exercise parts provided at the main body part so as to be arranged at the upper part of the chair part, and applying resistance to a motion, in which the user sitting on the chair part pushes the head thereof in at least one direction, so as to strengthen the neck muscle of the user.