To provide an impact testing device for a vehicle for simply protecting collision with a chuck even when an impactor collides with the vehicle to be rebounded.

The impact testing device for the vehicle comprises a shutter door 18 swingable on a cylinder part 14 separating the impactor 16 from the chuck 15. The shutter door 18 is opened between the chuck 15 and the vehicle 2 until the impactor 16 is separated from the chuck 15. When the impactor 16 is separated from the chuck 15 to be rebounded, the impact testing device is moved to a position blocking between the chuck 15 and the vehicle 2 by movement of a vehicle direction of the cylinder part 14.