Patent ID: 8875508

Claim:
An electric booster, comprising: an ECU; an electric motor adapted to rotate in response to an instruction from the ECU; a rotation-linear motion converting mechanism operable to convert a rotation of the electric motor into a linear motion; an output member operable to transmit the converted linear motion; and a master cylinder operable to generate a brake fluid pressure by a piston advanced by the output member; wherein the electric motor includes a cylindrical first housing having an opening on at least one side thereof, and a second housing covering the opening; an annular stator is contained in the first housing; an ECU casing containing the ECU is attached to the outer surface of the first housing so as to be situated near the stator; a through-hole is formed at an axially intermediate position of the first housing where the ECU casing is attached; and the stator and the ECU are connected through a predetermined-shaped conductor extending through the through-hole.