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 (123, 124) 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 (123, 124) is accommodated; a drive circuit (80, 230) on which a switching element (Q1~Q6) is mounted and which drives the brushless motor; a first circuit board on which the drive circuit (80, 230) 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 (123, 124) 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 (123, 124) is accommodated; a drive circuit (80, 230) on which a switching element (Q1~Q6) is mounted and which drives the brushless motor; a first circuit board on which the drive circuit (80, 230) 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.