An electrically powered tool comprising: a cylindrical integral motor housing that accommodates and supports a brushless motor ; a cooling fan that is rotated by the brushless motor ; a spindle that is rotated by the brushless motor ; a power transmission mechanism configured to transmit a rotational force of the brushless motor to the spindle ; a handle housing connected to one side of the motor housing and having a grip section ; and a gear case which is attached to another side of the motor housing in an axial direction and in which the power transmission mechanism is accommodated; a drive circuit on which a switching element (Q1~Q6) is mounted and which drives the brushless motor ; a first circuit board on which the drive circuit is mounted; a second circuit board on which an operation unit configured to control the switching element (Q1~Q6) is mounted, wherein an air flow window is provided in the handle housing and a discharge opening is provided in the gear case , and when the cooling fan rotates, air is sucked from the air flow window into the handle housing , the air passes through an inside of the motor housing and cools the drive circuit , and then cools the brushless motor , and is discharged from the discharge opening to an outside, wherein the handle housing is divisible and has a diameter-increased section that has a larger diameter than the grip section and is connected to the motor housing , the diameter-increased section is positioned between the grip section and the motor housing , and the air flow window is provided in the diameter-increased section , characterized in that the second circuit board is accommodated in the diameter-increased section of the handle housing , the first circuit board is disposed between the second circuit board and the brushless motor , the air flow window is disposed between the first circuit board and the second circuit board . a cylindrical integral motor housing that accommodates and supports a brushless motor ; a cooling fan that is rotated by the brushless motor ; a spindle that is rotated by the brushless motor ; a power transmission mechanism configured to transmit a rotational force of the brushless motor to the spindle ; a handle housing connected to one side of the motor housing and having a grip section ; and a gear case which is attached to another side of the motor housing in an axial direction and in which the power transmission mechanism is accommodated; a drive circuit on which a switching element (Q1~Q6) is mounted and which drives the brushless motor ; a first circuit board on which the drive circuit is mounted; a second circuit board on which an operation unit configured to control the switching element (Q1~Q6) is mounted, wherein an air flow window is provided in the handle housing and a discharge opening is provided in the gear case , and when the cooling fan rotates, air is sucked from the air flow window into the handle housing , the air passes through an inside of the motor housing and cools the drive circuit , and then cools the brushless motor , and is discharged from the discharge opening to an outside, wherein the handle housing is divisible and has a diameter-increased section that has a larger diameter than the grip section and is connected to the motor housing , the diameter-increased section is positioned between the grip section and the motor housing , and the air flow window is provided in the diameter-increased section , characterized in that the second circuit board is accommodated in the diameter-increased section of the handle housing , the first circuit board is disposed between the second circuit board and the brushless motor , the air flow window is disposed between the first circuit board and the second circuit board . <EOS>