Patent ID: 8350685

Claim:
A collision detecting device for a vehicle comprising: a chamber member providing a space, and arranged in front of a bumper reinforcement extending in a lateral direction of the vehicle; a pressure sensor connected to the chamber member, and detecting a pressure inside the space; and a bumper absorber absorbing an impact generated by collision of an object with the vehicle, and arranged in front of the bumper reinforcement, wherein the bumper absorber has a region, which has a thickness in a front-rear direction of the vehicle, wherein the thickness of the region is equal to or smaller than a predetermined thickness, wherein the region is in contact with at least a portion of the chamber member, wherein the collision is detected based on the pressure of the space detected by the pressure sensor, wherein a rear side end surface of the bumper absorber is in contact with a front surface of the bumper reinforcement, wherein the region is a flexible portion and the bumper absorber further includes a main body portion, wherein the main body portion extends to a front side of the bumper reinforcement and has a predetermined rigidity, wherein the flexible portion is arranged in front of an end surface of the main body portion, and bends in a rear direction with a load generated by an impact of the collision, wherein the flexible portion is a plate shaped cantilever extending from and supported only on the main body portion in an up direction or a down direction of the vehicle, and wherein a rear side end surface of the chamber member is in contact with the front surface of the bumper reinforcement, and the chamber member is arranged on a rear side of the flexible portion.