Patent ID: 8864196

Claim:
A pedestrian collision detection device applied to a vehicle bumper including a bumper reinforcement disposed with length direction oriented in a vehicle width direction as a bumper framework member spanning between vehicle front-rear direction outside end portions of a pair of left and right side members and a bumper cover disposed at a vehicle front-rear direction outside of the bumper reinforcement, with length direction oriented in the vehicle width direction along the bumper reinforcement and with both length direction end portions bent towards the vehicle front-rear direction inside, the pedestrian collision detection device comprising: a chamber member disposed adjacent to a vehicle front-rear direction outside face of the bumper reinforcement, with length direction oriented in the vehicle width direction along the bumper reinforcement and an inside portion of the chamber member configured as a pressure chamber; a spacer disposed at a back face of the bumper cover at a location corresponding to a vehicle width direction outside terminal portion of the chamber member; a pressure detector that is disposed in the chamber member and that outputs a signal according to changes in pressure inside the pressure chamber; and a collision determination section that determines whether or not a collision with a pedestrian has occurred based on output from the pressure detector, wherein a vehicle width direction outside terminal portion of the chamber member is wrapped around so as to cover a vehicle width direction outside end face of the bumper reinforcement at a bumper corner portion side, and is configured such that when a load of a specific value or greater is input from a lateral side of the bumper cover during a collision, the spacer is configured to transmit the load from the bumper cover to the chamber member and the vehicle width direction outside terminal portion of the chamber member obtains reaction force of the bumper reinforcement and undergoes compression deformation towards the vehicle width direction inside.