To provide a motor output controller of a motor four wheel drive vehicle capable of ensuring stability of the vehicle upon occurrence of driven wheel acceleration slip by suppressing the acceleration slip quickly.

The motor four wheel drive vehicle where the main drive wheel is driven through an engine 2, and the driven wheel is driven through a motor 4 which is driven with electric energy generated from a generator 7 being driven through the engine 2 comprises a regulation relay having a semiconductor switch element provided in the way of a wire 9 coupling the generator 7 and the motor 4, a means for detecting acceleration slip of the driven wheel, and a motor output control means for controlling the regulation relay to suppress output from the motor 4 when acceleration slip of the driven wheel is detected.

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