To exactly detect the travel azimuth, based on right and left wheel speeds even during slow running of a vehicle.

The travel azimuth detector for detecting the travel azimuth, based on the difference between the numbers of revolution of right and left wheels, comprises means (steps S4, S5, S9) for obtaining the travel azimuth, based on the number of rotation difference when the numbers of rotation of the wheels exceed specified values in a low vehicle speed condition below a specified vehicle speed.