Brushless motor

A brushless motor comprising:

• a housing;
• a rotor having a rotation shaft and a magnet with polarization directions arranged so as to be alternatingly inverted along a circumferential direction centered about the rotation shaft, the rotor being attached to the housing in a manner of being capable of rotating with the rotation shaft serving as a center of rotation;
• a stator having a plurality of coils arranged along the circumferential direction centered about the rotation shaft so as to oppose the magnet of the rotor, the stator causing the rotor to rotate by interaction between a magnetic field generated by the magnet of the rotor and magnetic fields generated by the plurality of coils due to current flowing in the plurality of coils;
• at least one rotation angle sensor that detects a rotation angle of the rotor;
• and
• a protection portion that is provided at a location farther from the rotation shaft than the at least one rotation angle sensor is, and that is formed by a grounded conductor.