To expand a work range of a detector supported by a license plate holder to a corner area of a vehicle.

This license plate holder for a vehicle with supports is for supporting a detector such as a sensor, a transducer, and a micro camera. It is provided with at least a pair of supports, and each support is composed of a hollow part for housing the detector. The supports are arranged along an axis that is nonparallel to an installation surface of a frame main body, and diagonal. The axis of one support is converged toward the frame main body in such a way that a detection range of the detector is substantially composed of a range existing substantially ahead of the frame main body. The axis of the other support is diverged from the frame main body in such a way that the detection range of the detector is substantially composed of the corner range of the vehicle.