ELECTRIC BRAKE DEVICE AND ELECTRIC BRAKE DEVICE SYSTEM

Provided are an electric brake device and an electric brake device system that can prevent pad wear from progressing beyond its limit and that can estimate the wear of a friction pad without involving increase in cost and space. The electric brake device includes an electric motor (2), a friction pad (6), a linear motion mechanism (4), a braking force command section (26a), a braking force estimation section (30), and a controller (7). The controller (7) is provided with a pad wear amount estimation section (37) to estimate a wear amount of the friction pad and a motor rotation angle detector (28) to detect a motor rotation angle. The pad wear amount estimation section (37) estimates a wear amount of the friction pad (6) from the rotation angle of the electric motor (2), obtained by the motor rotation angle detector (28), which rotation angle corresponds to a distance between a retraction end at which a linear motion portion (14) of the linear motion mechanism (4) is separated from a brake rotor (5) and an advance end at which the linear motion portion (14) approaching the brake rotor (5) generates the braking force.