Side collision energy absorbing structure

A side collision energy absorbing structure comprising:

• an energy absorber made of molded resin and formed separately from a door trim, the energy absorber comprising:
• a deformable portion including a peripheral wall, the deformable portion protruded outward in a vehicle width direction;
• and
• a plurality of mounting flange portions formed in an end portion of the peripheral wall on a door trim side, the mounting flange portions extending along the door trim, wherein the energy absorber is mounted on the door trim via the plurality of mounting flange portions,
• wherein at least one of the plurality of mounting flange portions has an elongated hole formed therein,
• wherein a boss portion protruded outward from the door trim in the vehicle width direction is inserted in the elongated hole, and
• wherein the elongated hole extends in a direction from a portion of the elongated hole where the boss portion is inserted toward the deformable portion, and the direction in which the elongated hole extends makes an acute angle with a direction from the portion of the elongated hole where the boss portion is inserted to a center of the deformable portion so as to allow the at least one of the plurality of mounting flange portions to be displaced in a direction away from the deformable portion during deformation of the deformable portion at a time of side collision.