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The invention relates to a head rest formed in the vehicle or the chair for business use. The head rest installed in the driver seat or the passenger seat of the vehicle is used for preventing the neck from being reclined when the driver is shocked from behind during driving or for taking a rest, but the former is extremely rare and most head rests are used for taking a rest. When putting the head to the head rest by leaning the head back to take a rest, the head rest has a curved surface or flat surface, a part of the round back head can be put on the head rests, the center of the head can be shaken in the right and left directions, and the neck muscles can be tensed to maintain the posture of the head, so that most head rests are inconvenient for taking a rest completely and comfortably. According to the invention, to solve the above problem and enable a user to take a rest comfortably, when the head is put on the head rest, two parts of the back head can be tightly contacted to the headrest to be symmetrical, and the head is prevented from being moved or shaken, thereby taking a rest with the comfortable posture by relieving tension of the muscle nerves of the neck and the whole body.COPYRIGHT KIPO 2014