An electric tool, comprising: a motor, having a stator which has a coil, a rotor capable of rotating with respect to the stator and a rotation shaft capable of integrally rotating with the rotor; a casing, accommodating the motor and having a ventilating window (48, 49); a controller, controlling power supply to the coil; and a cooling fan, sucking an external gas through the ventilating window (48, 49) to cool off the motor, wherein a magnetic body for rotational position detection is disposed to the rotation shaft, a magnetic detection unit (41, 42, 43, 44) detecting a rotational position of the magnetic body is disposed to output a position signal to the controller, and the electrical tool is characterized by: a control substrate, mounted in a housing, the controller being mounted on the control substrate; wherein the magnetic detection unit (41, 42, 43, 44) has a circuit substrate and a plurality of Hall ICs (41, 42, 43) disposed on the circuit substrate, the circuit substrate is disposed in extending directions along an up-down direction and a left-right direction and is orthogonal to a direction of the rotation shaft, the control substrate is in an arrangement orthogonal to the circuit substrate, and the circuit substrate and the plurality of Hall ICs (41, 42, 43) and the magnetic body are disposed to be isolated from a wind path of a cooling wind generated by rotation of the cooling fan. a motor, having a stator which has a coil, a rotor capable of rotating with respect to the stator and a rotation shaft capable of integrally rotating with the rotor; a casing, accommodating the motor and having a ventilating window (48, 49); a controller, controlling power supply to the coil; and a cooling fan, sucking an external gas through the ventilating window (48, 49) to cool off the motor, wherein a magnetic body for rotational position detection is disposed to the rotation shaft, a magnetic detection unit (41, 42, 43, 44) detecting a rotational position of the magnetic body is disposed to output a position signal to the controller, and the electrical tool is characterized by: a control substrate, mounted in a housing, the controller being mounted on the control substrate; wherein the magnetic detection unit (41, 42, 43, 44) has a circuit substrate and a plurality of Hall ICs (41, 42, 43) disposed on the circuit substrate, the circuit substrate is disposed in extending directions along an up-down direction and a left-right direction and is orthogonal to a direction of the rotation shaft, the control substrate is in an arrangement orthogonal to the circuit substrate, and the circuit substrate and the plurality of Hall ICs (41, 42, 43) and the magnetic body are disposed to be isolated from a wind path of a cooling wind generated by rotation of the cooling fan. a control substrate, mounted in a housing, the controller being mounted on the control substrate; wherein the magnetic detection unit (41, 42, 43, 44) has a circuit substrate and a plurality of Hall ICs (41, 42, 43) disposed on the circuit substrate, the circuit substrate is disposed in extending directions along an up-down direction and a left-right direction and is orthogonal to a direction of the rotation shaft, the control substrate is in an arrangement orthogonal to the circuit substrate, and the circuit substrate and the plurality of Hall ICs (41, 42, 43) and the magnetic body are disposed to be isolated from a wind path of a cooling wind generated by rotation of the cooling fan.