A sensing device including a first stator tooth with a plurality of first teeth, a second stator tooth with a plurality of second teeth, in which the first tooth overlaps the second tooth in a radial direction from a center of the stator, and a first angle formed between two ends of a first pole of a magnet based on the center of the stator is the same as a second angle formed between two ends of the first tooth based on the center of the stator.