Impact absorbing panel unit of a vehicle interior

A panel unit includes a housing (1), a rotary knob provided on front face of the housing (1), and a plurality of mounting pieces (4,5,6), which is disposed around the rotary knob and is integrally formed on side faces of the housing (1). The housing (1) is mounted in a vehicle so that the rotary knob is exposed to an interior of the vehicle by fixing the mounting pieces (4,5,6) to respective bosses. Only one of the plurality of mounting pieces (4,5,6) is provided with a V-shaped groove (5b), and the groove is ruptured at a time when a pressure over a predetermined value is applied on the rotary knob so that the housing (1) can be buried in a direction in which the pressure is applied.