A resolver stator that is mounted on a target structure including a knock pin, the target structure having a hole, a portion of the knock pin being disposed in the hole, the resolver stator including: a stator core that has an engaging groove configured to be engaged with the knock pin, and the stator core includes a yoke; and a resolver cover covering the yoke in a central axis direction of the resolver cover, the resolver cover being made from metal and having a first cutout, the first cutout being disposed such that the first cutout overlaps at least a part of an end surface of the knock pin engaged with the engaging groove, at the center axial direction.