To provide an impact force buffer device compactly and inexpensively manufactured and providing stable resistance characteristics.

In this impact force buffer device, a buffering part is inserted between an external force receiving part and a fixed part which are arranged along a force buffering direction to thereby absorb impact force. The buffering part 6 is provided with shock absorbing members 8 which are so arranged that their front and rear surfaces are directed in the force buffering direction, and insertion rods 12 having each one end opposed to at least one of the front and rear surfaces of the shock absorbing members and parallel to the force buffering direction. One side of each of the shock absorbing members 8 and insertion rods 12 is interlocked with the external force receiving part 4, and also the other thereof is linked with the fixed part 16, thereby performing buffering. Therefore, when impact force is applied to the external force receiving part 4, the insertion rods 12 collides with a part of the front or rear surfaces of the shock absorbing members 8. The shock absorbing members 8 are made of materials into which the insertion rods can penetrate by cave-in of the collided portions.