To determine a rotor stop position with high accuracy.

A brushless motor 2 rotatably supports a rotor with a permanent magnet in an opposite position to a stator around which a plurality of coils U, V, and W are wound. A rotor stop position determination apparatus 1 included in the brushless motor 2 comprises: a coil conduction part 3 for conducting electricity to a plurality of coil conduction paths (a UV phase, a VU phase, a VW phase, a WU phase, and a UW phase) individually; a saturation point detector 4 for detecting a saturation point of a current value at each coil conduction path; and a controller 5 for measuring time from beginning of electricity conduction to detection of the saturation point of the current value, and determining a stop position for the rotor according to the measured time of each coil conduction path. The saturation point detector 4 detects transitive decrease of the current value obtained when the current value at each coil conduction path reaches the saturation point.