A steering angle correction device which corrects a discrepancy between a steering angle and a turning angle of a steering wheel in a power steering device comprising a working oil supply device for ejecting the oil in a quantity corresponding to the extent of turning of the steering wheel and an actuator driven by the working oil ejected from the working oil supply device to steer the steering wheel. In order to correct such a discrepancy, it is necessary to provide a steering angle correction device for power steering devices which can reduce an unnecessary idling of the steering wheel by correcting a steering angle on the basis of an absolute angle from a reference position and reduce the extent of unnecessary input for controlling the steering wheel. Steering angle detecting means detects an actual position of the steering wheel in terms of an angle relative to the reference position, and steering wheel turning angle detecting means detects a turning angle of the steering wheel. A target position as a normal position of the steering wheel is found in terms of a relative angle from the turning angle of the steering wheel by target position calculating means. When a discrepancy between the actual position of the steering wheel and the target position is outside an allowable range, correction means is driven to correct the discrepancy.