A hybrid drive module, which is disposed between an engine and a transmission of a power system and includes a motor configured to provide power to the transmission, the hybrid drive module comprising: a rotor hub 43 having a rotor holder to which a rotor of the motor is fixed and a hub plate 45 extending from the rotor holder to a radial inner side; a fluid clutch connected to the rotor hub; a first clutch pack connected to the rotor hub; a first piston plate configured to press or release the first clutch pack; a first accommodation space and a second accommodation space in the axial direction into which internal space of the hybrid drive module is divided by the hub plate, wherein the first accommodation space is provided in the rotor hub, configured to accommodate the fluid clutch, the first clutch pack and the first piston plate, and configured to allow a fluid for operating the fluid clutch and cooling the first clutch pack to flow and fill the first accommodation space; and a second clutch pack accommodated in the second accommodation space, wherein the first piston plate has a first surface directed toward the first clutch pack in an axial direction, and a second surface opposite to the first surface in the axial direction, wherein the second surface faces a first operation chamber filled with a fluid that generates pressure for moving the first piston plate toward the first clutch pack, and wherein a fluid for cooling the second clutch pack fills the second accommodation space and flows, characterized in that the first surface faces a first compensation chamber filled with a fluid with pressure lower than pressure of the fluid in the first accommodation space, and the hub plate, and the fluid in the second accommodation space fills the first compensation chamber through the rotor hub. a rotor hub 43 having a rotor holder to which a rotor of the motor is fixed and a hub plate 45 extending from the rotor holder to a radial inner side; a fluid clutch connected to the rotor hub; a first clutch pack connected to the rotor hub; a first piston plate configured to press or release the first clutch pack; a first accommodation space and a second accommodation space in the axial direction into which internal space of the hybrid drive module is divided by the hub plate, wherein the first accommodation space is provided in the rotor hub, configured to accommodate the fluid clutch, the first clutch pack and the first piston plate, and configured to allow a fluid for operating the fluid clutch and cooling the first clutch pack to flow and fill the first accommodation space; and a second clutch pack accommodated in the second accommodation space, wherein the first piston plate has a first surface directed toward the first clutch pack in an axial direction, and a second surface opposite to the first surface in the axial direction, wherein the second surface faces a first operation chamber filled with a fluid that generates pressure for moving the first piston plate toward the first clutch pack, and wherein a fluid for cooling the second clutch pack fills the second accommodation space and flows, characterized in that the first surface faces a first compensation chamber filled with a fluid with pressure lower than pressure of the fluid in the first accommodation space, and the hub plate, and the fluid in the second accommodation space fills the first compensation chamber through the rotor hub.