A stiffener for a vehicle, may include a coupling stiffener part, an upper stiffener part extending integrally from an upper end of the coupling stiffener part, and protruding to a forward direction of the vehicle with a predetermined length, and a lower stiffener part extending integrally from a lower end of the coupling stiffener part, and protruding to the forward direction of the vehicle, with a predetermined length, wherein the coupling stiffener is secured to a bumper back beam, and wherein the upper stiffener part and the lower stiffener part are complementarily operated about the coupling stiffener part serving as a support shaft in a seesaw type manner to absorb shocks, in the event of a collision between the vehicle and a pedestrian.