An electric tool comprising: a brushless motor comprising a rotor and a cylindrical stator surrounding the rotor; a circuit board provided with a switching element for controlling rotation of the rotor; a heat radiation member for transferring heat from the switching element; a cooling fan for generating a cooling wind; and a body housing which houses therein the brushless motor, the circuit board, the heat radiation member, and the cooling fan, and which has a cooling passage for passing therethrough the cooling wind, wherein the cooling passage is formed so that the cooling wind flows from a center side toward an outer periphery of the heat radiation member and thereafter flows over a surface of the circuit board facing the brushless motor, the circuit board has a first surface and a second surface opposite the first surface, the heat radiation member is shaped like a plate, and has a first surface and a second surface opposite the first surface, the circuit board is disposed so that the second surface thereof faces the brushless motor and that a first gap is formed between an outer periphery thereof and an inner surface of the body housing, the switching element is mounted on the first surface of the circuit board, the heat radiation member is disposed so that the second surface thereof faces the first surface of the circuit board and that a second gap is formed between the outer periphery thereof and an inner surface of the body housing, and the cooling passage is formed so that the cooling wind flows from the center side toward the outer periphery of the heat radiation member at the first surface side of the circuit board, and then flows through the second and the first gaps (123, 103), and thereafter flows along the circuit board at the second surface side of the circuit board. a brushless motor comprising a rotor and a cylindrical stator surrounding the rotor; a circuit board provided with a switching element for controlling rotation of the rotor; a heat radiation member for transferring heat from the switching element; a cooling fan for generating a cooling wind; and a body housing which houses therein the brushless motor, the circuit board, the heat radiation member, and the cooling fan, and which has a cooling passage for passing therethrough the cooling wind, wherein the cooling passage is formed so that the cooling wind flows from a center side toward an outer periphery of the heat radiation member and thereafter flows over a surface of the circuit board facing the brushless motor, the circuit board has a first surface and a second surface opposite the first surface, the heat radiation member is shaped like a plate, and has a first surface and a second surface opposite the first surface, the circuit board is disposed so that the second surface thereof faces the brushless motor and that a first gap is formed between an outer periphery thereof and an inner surface of the body housing, the switching element is mounted on the first surface of the circuit board, the heat radiation member is disposed so that the second surface thereof faces the first surface of the circuit board and that a second gap is formed between the outer periphery thereof and an inner surface of the body housing, and the cooling passage is formed so that the cooling wind flows from the center side toward the outer periphery of the heat radiation member at the first surface side of the circuit board, and then flows through the second and the first gaps (123, 103), and thereafter flows along the circuit board at the second surface side of the circuit board.