An electric brake device comprising: an electric motor; a brake rotor configured to rotate integrally with a wheel; a friction pad configured to come into contact with the brake rotor to generate a braking force; a conversion mechanism configured to convert a rotary motion of the electric motor into an advancing or retracting motion of the friction pad; a braking force command section configured to command a target braking force; a braking force estimation section configured to obtain an estimated value of the braking force generated by pressing the friction pad against the brake rotor; a controller configured to drive the electric motor such that the target braking force commanded by the braking force command section is achieved; and a power supply device configured to supply power to each of the controller and the electric motor, characterised in that the controller includes: a power determination section configured to determine whether an amount of remaining power that can be supplied from the power supply device to the electric motor has become equal to or less than a determined value; and a residual pressure cancellation section configured to cancel a residual pressure of the braking force by driving the electric motor in a direction opposite to a brake pressing direction such that the estimated value of the braking force obtained by the braking force estimation section becomes equal to or less than a set value, when the power determination section determines that the amount of remaining power has become equal to or less than the determined value. an electric motor; a brake rotor configured to rotate integrally with a wheel; a friction pad configured to come into contact with the brake rotor to generate a braking force; a conversion mechanism configured to convert a rotary motion of the electric motor into an advancing or retracting motion of the friction pad; a braking force command section configured to command a target braking force; a braking force estimation section configured to obtain an estimated value of the braking force generated by pressing the friction pad against the brake rotor; a controller configured to drive the electric motor such that the target braking force commanded by the braking force command section is achieved; and a power supply device configured to supply power to each of the controller and the electric motor, characterised in that the controller includes: a power determination section configured to determine whether an amount of remaining power that can be supplied from the power supply device to the electric motor has become equal to or less than a determined value; and a residual pressure cancellation section configured to cancel a residual pressure of the braking force by driving the electric motor in a direction opposite to a brake pressing direction such that the estimated value of the braking force obtained by the braking force estimation section becomes equal to or less than a set value, when the power determination section determines that the amount of remaining power has become equal to or less than the determined value. a power determination section configured to determine whether an amount of remaining power that can be supplied from the power supply device to the electric motor has become equal to or less than a determined value; and a residual pressure cancellation section configured to cancel a residual pressure of the braking force by driving the electric motor in a direction opposite to a brake pressing direction such that the estimated value of the braking force obtained by the braking force estimation section becomes equal to or less than a set value, when the power determination section determines that the amount of remaining power has become equal to or less than the determined value.