To provide an electric brake device and its looseness sensing method capable of certainly preventing a brake shoe from being over-returned.

The invention includes a back-stop detection part 6 which is furnished with a determination processing part 6a operating fully independently a control part 5 and a total counter 6b to count the total rotational amount of a motor 2 in the loosening direction of the brake force on the basis of the rotating amount sensed by a rotational amount sensing part 4. The determination processing part 6a determines whether the total rotational amount given by the counter 6b has exceeded a specified value and stops the motor 2 forcedly when the total rotational amount further has exceeded the specified value.