Cover body for air bag apparatus

A cover body covering an air bag apparatus, the cover body being integral with an interior panel of a vehicle, the cover body comprising:

• a covering portion which is formed integrally with an interior panel body, the covering portion having a door portion defined by a tear seam formed in a closed-loop shape in a back surface of the interior panel body, the covering portion being made of polyolefin resin which has a flexual elastic modulus of from 1500 to 3500 MPa, a tensile strength of from 17 to 40 MPa, an Izod impact strength of from 3.0 to 15.0 kJ/m2, and an elongation of 400% or less;
• and
• a backing portion which is joined to a back of the covering portion including the door portion, the backing portion being made of thermoplastic olefin which is softer on the basis of a measurement of flexural elastic modulus and has a greater elongation than the polyolefin resin;
• wherein the backing portion comprises a reinforcing portion joined to a back surface of the door portion, a surrounding base which is joined to the back surface of the covering portion surrounding the door portion and having an attachment portion, and a hinge portion having an end joined to the reinforcing portion and another end joined to the surrounding base.