An impact wrench comprising: - a motor unit with a motor accommodated in a main housing of the wrench and adapted to produce a rotary motion, as well as an operating switch for actuating the motor, - a tool-holder shaft which is rotatable about a rotation axis, - a transmission unit with a percussion mechanism connected between the motor unit and the tool-holder shaft, - an electronic control system, containing at least one electronic control board, connected to one or more electric batteries and to the operating switch, wherein the transmission unit interacts with the motor and with the tool-holder shaft so as to transmit the rotary motion from the motor to the tool-holder shaft for rotating the tool-holder shaft about the rotation axis, - a cooling fan for the motor configured to be activated together with the operation of the motor for sucking ambient air through an air inlet opening formed in the main housing, conveying the sucked air along the motor and expelling the conveyed air through an air outlet opening formed in the main housing, wherein the motor is accommodated inside a dedicated motor compartment of the main housing and at least one heat sensitive part of the electronic control system, containing at least one electronic control board, is accommodated inside a protected compartment of the main housing, characterized in that: - the impact wrench comprises a handlebar structure with two gripping handles (9, 10) for manually gripping the wrench, - the protected compartment borders directly on, but is not in communication with, the motor compartment and is separated from the motor compartment by a separation wall, and the cooling fan conveys the cooling air flow only in the motor compartment also along the separation wall, - the separation wall comprises a metal radiator directly facing into the motor compartment and in a heat exchange relationship with the heat sensitive part of the electronic control system in the protected compartment. - a motor unit with a motor accommodated in a main housing of the wrench and adapted to produce a rotary motion, as well as an operating switch for actuating the motor, - a tool-holder shaft which is rotatable about a rotation axis, - a transmission unit with a percussion mechanism connected between the motor unit and the tool-holder shaft, - an electronic control system, containing at least one electronic control board, connected to one or more electric batteries and to the operating switch, wherein the transmission unit interacts with the motor and with the tool-holder shaft so as to transmit the rotary motion from the motor to the tool-holder shaft for rotating the tool-holder shaft about the rotation axis, - a cooling fan for the motor configured to be activated together with the operation of the motor for sucking ambient air through an air inlet opening formed in the main housing, conveying the sucked air along the motor and expelling the conveyed air through an air outlet opening formed in the main housing, wherein the motor is accommodated inside a dedicated motor compartment of the main housing and at least one heat sensitive part of the electronic control system, containing at least one electronic control board, is accommodated inside a protected compartment of the main housing, characterized in that: - the impact wrench comprises a handlebar structure with two gripping handles (9, 10) for manually gripping the wrench, - the protected compartment borders directly on, but is not in communication with, the motor compartment and is separated from the motor compartment by a separation wall, and the cooling fan conveys the cooling air flow only in the motor compartment also along the separation wall, - the separation wall comprises a metal radiator directly facing into the motor compartment and in a heat exchange relationship with the heat sensitive part of the electronic control system in the protected compartment. wherein the motor is accommodated inside a dedicated motor compartment of the main housing and at least one heat sensitive part of the electronic control system, containing at least one electronic control board, is accommodated inside a protected compartment of the main housing, characterized in that: - the impact wrench comprises a handlebar structure with two gripping handles (9, 10) for manually gripping the wrench, - the protected compartment borders directly on, but is not in communication with, the motor compartment and is separated from the motor compartment by a separation wall, and the cooling fan conveys the cooling air flow only in the motor compartment also along the separation wall, - the separation wall comprises a metal radiator directly facing into the motor compartment and in a heat exchange relationship with the heat sensitive part of the electronic control system in the protected compartment. - the impact wrench comprises a handlebar structure with two gripping handles (9, 10) for manually gripping the wrench, - the protected compartment borders directly on, but is not in communication with, the motor compartment and is separated from the motor compartment by a separation wall, and the cooling fan conveys the cooling air flow only in the motor compartment also along the separation wall, - the separation wall comprises a metal radiator directly facing into the motor compartment and in a heat exchange relationship with the heat sensitive part of the electronic control system in the protected compartment.