A brushless motor includes a stator including three-phase windings, a rotor that includes a permanent magnet and rotates in a state facing the stator, an inverter that includes a plurality of switching elements and conducts an alternating current to the three-phase windings by turning on or off the plurality of switching elements, and a controller that controls on or off states of the plurality of switching elements by switching an energization pattern, which represents changes in energization states of phases of the three-phase windings according to rotation of the rotor, to a freeless energization pattern or a rectangular wave energization pattern, wherein the controller switches the energization pattern to the freeless energization pattern when an accumulated load value determined according to a load on the rotor is less than a first predetermined threshold value and switch the energization pattern to the rectangular wave energization pattern when the accumulated load value is equal to or greater than the first predetermined threshold value.