Shock absorbing auxiliary member for absorbing shock in head lining of vehicle

An auxiliary member for absorbing shock in a head lining of a vehicle, comprising:

• a corrugation member which is installed between a roof panel and a head lining and in which a plurality of corrugated portions are continuously and repeatedly formed long in a transverse direction of the vehicle,
• wherein each of the corrugated portions is divided into at least two areas having heights which are connected with each other and are the same as or similar to a distance between the roof panel and the head lining,
• a height of each area is selected to have a height the same as or less than the distance, and a width of each area is selected from set multiple widths based on the selected height, and
• a corrugation member, in which the corrugation portions having the same sizes are repeatedly formed, is inserted between the roof panel and the head lining, and tested according to head injury criterion (HIC(d)) while the width is changed by a unit width in a state in which the height is fixed, and then tested again while the height is changed by a unit height and the width is also changed by the unit width, and a height and a width in which a head injury value is 1000 or less are obtained, and the height and the width are the height and width in which the head injury value is 1000 or less.