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 ; a controller , controlling power supply to the coil ; and a cooling fan , sucking an external gas through the ventilating window to cool off the motor , wherein a magnetic body for rotational position detection is disposed to the rotation shaft , a magnetic detection unit 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 has a circuit substrate and a plurality of Hall ICs 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 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 ; a controller , controlling power supply to the coil ; and a cooling fan , sucking an external gas through the ventilating window to cool off the motor , wherein a magnetic body for rotational position detection is disposed to the rotation shaft , a magnetic detection unit 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 has a circuit substrate and a plurality of Hall ICs 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 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 has a circuit substrate and a plurality of Hall ICs 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 and the magnetic body are disposed to be isolated from a wind path of a cooling wind generated by rotation of the cooling fan . <EOS>