A redundancy resolver device, comprising: a resolver main body including a stator, and a rotor rotatable with respect to the stator; and a control unit including a plurality of excitation circuits (13, 15, 17), the stator including a stator core, and winding groups (12a-12i) of a plurality of systems provided in the stator core, the stator core including a core back portion, and a plurality of teeth which protrude from the core back portion, the winding groups (12a-12i) of different systems being arranged at different positions in a circumferential direction of the stator core, the winding groups (12a-12i) of each of the plurality of systems including: an excitation winding group (12a, 12d, 12g) consisting of a plurality of excitation windings (11a, 11d, 11g), and being connected to corresponding one of the plurality of excitation circuits (13, 15, 17); a first output winding group (12b, 12e, 12h) consisting of a plurality of first output windings (11b, 11e, 11h); and a second output winding group (12c, 12f, 12i) consisting of a plurality of second output windings (11c, 11f, 11i), each of the plurality of teeth having corresponding one of the plurality of excitation windings (11a, 11d, 11g) wound therearound, when two of the plurality of excitation windings (11a, 11d, 11g) belonging to different systems and being arranged side by side in the circumferential direction of the stator core are defined as a first end excitation winding and a second end excitation winding, respectively, the first end excitation winding and the second end excitation winding being applied with excitation signals to generate magnetic fluxes in the same direction of radial directions of the stator core. a resolver main body including a stator, and a rotor rotatable with respect to the stator; and a control unit including a plurality of excitation circuits (13, 15, 17), the stator including a stator core, and winding groups (12a-12i) of a plurality of systems provided in the stator core, the stator core including a core back portion, and a plurality of teeth which protrude from the core back portion, the winding groups (12a-12i) of different systems being arranged at different positions in a circumferential direction of the stator core, the winding groups (12a-12i) of each of the plurality of systems including: an excitation winding group (12a, 12d, 12g) consisting of a plurality of excitation windings (11a, 11d, 11g), and being connected to corresponding one of the plurality of excitation circuits (13, 15, 17); a first output winding group (12b, 12e, 12h) consisting of a plurality of first output windings (11b, 11e, 11h); and a second output winding group (12c, 12f, 12i) consisting of a plurality of second output windings (11c, 11f, 11i), each of the plurality of teeth having corresponding one of the plurality of excitation windings (11a, 11d, 11g) wound therearound, when two of the plurality of excitation windings (11a, 11d, 11g) belonging to different systems and being arranged side by side in the circumferential direction of the stator core are defined as a first end excitation winding and a second end excitation winding, respectively, the first end excitation winding and the second end excitation winding being applied with excitation signals to generate magnetic fluxes in the same direction of radial directions of the stator core. the stator including a stator core, and winding groups (12a-12i) of a plurality of systems provided in the stator core, the stator core including a core back portion, and a plurality of teeth which protrude from the core back portion, the winding groups (12a-12i) of different systems being arranged at different positions in a circumferential direction of the stator core, the winding groups (12a-12i) of each of the plurality of systems including: an excitation winding group (12a, 12d, 12g) consisting of a plurality of excitation windings (11a, 11d, 11g), and being connected to corresponding one of the plurality of excitation circuits (13, 15, 17); a first output winding group (12b, 12e, 12h) consisting of a plurality of first output windings (11b, 11e, 11h); and a second output winding group (12c, 12f, 12i) consisting of a plurality of second output windings (11c, 11f, 11i), an excitation winding group (12a, 12d, 12g) consisting of a plurality of excitation windings (11a, 11d, 11g), and being connected to corresponding one of the plurality of excitation circuits (13, 15, 17); a first output winding group (12b, 12e, 12h) consisting of a plurality of first output windings (11b, 11e, 11h); and a second output winding group (12c, 12f, 12i) consisting of a plurality of second output windings (11c, 11f, 11i), each of the plurality of teeth having corresponding one of the plurality of excitation windings (11a, 11d, 11g) wound therearound, when two of the plurality of excitation windings (11a, 11d, 11g) belonging to different systems and being arranged side by side in the circumferential direction of the stator core are defined as a first end excitation winding and a second end excitation winding, respectively, the first end excitation winding and the second end excitation winding being applied with excitation signals to generate magnetic fluxes in the same direction of radial directions of the stator core.