ELECTRIC POWER STEERING APPARATUS

An electric power steering apparatus that performs steering assist by transmitting a driving force produced by an electric motor to a steering mechanism. The apparatus is provided with a current detection circuit for detecting a current flowing through the electric motor to output a motor current detection signal, and a microcomputer for controlling the electric motor on the basis of the motor current detection signal. The current detection circuit has a variable gain amplification circuit, to output the motor current detection signal amplified by the variable gain amplification circuit. The microcomputer has an analog-to-digital conversion port to which the motor current detection signal outputted by the current detection circuit is inputted, to receive the motor current detection signal through the analog-to-digital conversion port. The apparatus is further provided with a gain change section for changing the gain of the variable gain amplification circuit.