An electric power steering apparatus comprising: a steering torque detecting means for detecting a steering torque applied to a steering mechanism; a motor for generating an assist force that assists steering of a steering wheel ; a power voltage detecting means for detecting a power voltage of a power supply; a power voltage monitoring section for determining a power voltage detection value detected by said power voltage detecting means; and a motor drive control means (31, 33-37) for calculating an assist amount based on said steering torque and controlling drive of said motor through a driving section comprising an FET-bridge, characterized in that said electric steering apparatus further comprises: an assist amount correction section for generating an assist amount correction value based on said power supply voltage detection value, wherein said assist amount is corrected by using said assist amount correction value, and wherein an assist control is maintained based on a drive possible characteristic that an assist maintaining time becomes shorter according to said power voltage detection value of said power voltage of FETs comprising said FET-bridge becoming lower during the period when said power supply voltage is equal to or lower than said assist operation enable voltage, when said power voltage monitoring section determined that said power voltage detection value is less than or equal to an assist operation possible power voltage. a steering torque detecting means for detecting a steering torque applied to a steering mechanism; a motor for generating an assist force that assists steering of a steering wheel ; a power voltage detecting means for detecting a power voltage of a power supply; a power voltage monitoring section for determining a power voltage detection value detected by said power voltage detecting means; and a motor drive control means (31, 33-37) for calculating an assist amount based on said steering torque and controlling drive of said motor through a driving section comprising an FET-bridge, characterized in that said electric steering apparatus further comprises: an assist amount correction section for generating an assist amount correction value based on said power supply voltage detection value, wherein said assist amount is corrected by using said assist amount correction value, and wherein an assist control is maintained based on a drive possible characteristic that an assist maintaining time becomes shorter according to said power voltage detection value of said power voltage of FETs comprising said FET-bridge becoming lower during the period when said power supply voltage is equal to or lower than said assist operation enable voltage, when said power voltage monitoring section determined that said power voltage detection value is less than or equal to an assist operation possible power voltage. an assist amount correction section for generating an assist amount correction value based on said power supply voltage detection value, wherein said assist amount is corrected by using said assist amount correction value, and wherein an assist control is maintained based on a drive possible characteristic that an assist maintaining time becomes shorter according to said power voltage detection value of said power voltage of FETs comprising said FET-bridge becoming lower during the period when said power supply voltage is equal to or lower than said assist operation enable voltage, when said power voltage monitoring section determined that said power voltage detection value is less than or equal to an assist operation possible power voltage. <EOS>