According to the present invention, a muscle relaxation apparatus comprises: a base body which has a back support unit and a hip support unit, both supporting the back and heap portions, respectively, of a user who is lying； and a cervical vertebral muscle relaxation unit which is installed at the base body and relaxes muscles around the cervical vertebrae of the user who is lying； the cervical vertebral muscle relaxation unit comprising: a support structure, a cervical vertebral support unit, and a left-right rotary motor, wherein the support structure has a contact surface which is flat and faces upward, and the cervical vertebral support unit has: a central shaft extending outward In the radial direction from a first rotary axis line, at the center, perpendicular to the contact surface； a rotary body coupled rotatably to the central shaft； a bevel gear unit； and a neck support unit supporting the neck of the user, wherein the central shaft is rotatable leftward or rightward around the first rotary axis line by the left-right rotary motor (150)； the rotary comes in contact with the contact surface to roll as the central shaft rotates； the bevel gear unit has a ring gear whose center is fixed to the central shaft and two pinion gears which are placed at the opposite sides with the central shaft placed therebetween, are coupled ratatably to the rotary body and interact with the ring gear； and the neck support unit is coupled rotatably to the two pinion gears and has two neck supporters supporting the opposite sides, respectively, of the neck of the user.본 발명에 의하면, 이용자가 누운 상태에서 이용자의 등 부분을 받치는 등 받침부와, 이용자의 엉덩이 부분을 받치는 엉덩이 받침부를 구비하는 베이스 몸체； 및 상기 베이스 몸체에 설치되어서, 이용자가 누운 상태에서 이용자의 경추 부분 근육을 이완시키는 경추부 근육 이완부를 포함하며, 상기 경추부 근육 이완부는 지지지 구조와, 경추 받침 유닛과, 좌우 회전 모터를 구비하며, 상기 지지 구조에는 편평하고 상부를 향하는 접촉면이 마련되고, 상기 경추 받침 유닛은, 상기 접촉면과 직각을 이루는 제1 회전축선을 중심으로 반경방향 바깥으로 연장되는 중심 샤프트와, 상기 중심 샤프트와 회전가능하게 결합된 회전 몸체와, 베벨기어부와, 이용자의 목을 받치는 목 받침부를 구비하며, 상기 중심 샤프트는 상기 제1 회전축선을 중심으로 상기 좌우 회전 모터(150)에
