Electric tool

An electric tool comprising:

• a motor configured to perform rotation operation;
• a holder configured to hold a tip tool;
• a transmission mechanism configured to transmit rotation of the motor to the holder;
• and
• a motor controller configured to stop the rotation of the motor,
• the motor including
• a rotor configured to be rotatable and including a magnet,
• a stator disposed around the rotor,
• a coil wound around the stator, and
• a plurality of magnetic sensors configured to detect an angle of rotation of the rotor,
• a number of the plurality of magnetic sensors being greater than a number of phases of the coil,
• the motor controller including
• a torque detector configured to detect a motor torque value which is a value of torque transmitted from the motor to the holder and
• a stop controller configured to perform, based on the motor torque value, stop control of controlling the motor such that the rotation of the motor stops,
• the electric tool further comprising a computing unit configured to compute, based on a detection result by the plurality of magnetic sensors, an inertial force of at least one of the rotor or the transmission mechanism after the stop controller starts the stop control.