HYDRAULIC UNIT FOR BRAKE SYSTEM

Disclosed is a hydraulic unit for a brake system. A hydraulic unit according to the present embodiment may include a main reservoir tank, a hydraulic block having a reservoir bore, a cylinder bore, a motor bore, a hydraulic flow path, and a valve bore, and an electronic control unit, in which the motor bore is provided on a first surface of the hydraulic block, in which a housing of the electronic control unit is provided on a second surface of the hydraulic block, in which the main reservoir tank includes a coupling part, an extension part, and a connection part.