A resolver device comprising: a stator core including a plurality of stator main poles (A1, A2, B1, B2, C1, C2), the number of which is an even multiple of three that is the number of phases, and that are arranged along a circumferential direction of a ring-shaped stator base such that respective exciting coils (L1 to L12) output three-phase output signals each of which is shifted by an electrical angle of +120 degrees or an electrical angle of -120 degrees in response to a one-phase excitation input signal; and a rotor core (12, 12A) supported so as to be freely rotatable with respect to the stator core and configured such that a reluctance component in a gap between the rotor core (12, 12A) and the stator core changes in accordance with a relative angle position to the stator core, the resolver device characterized by: a plurality of stator interpoles (IA1, IA2, IB1, IB2, IC1, IC2) for the respective phases that are included in the stator core, that are wound around by respective exciting coils (L1, L3, L5, L7, L9, L11) connected in series to the exciting coils (L2, L4, L6, L8, L10, L12) wound around the corresponding stator main poles (A1, A2, B1, B2, C1, C2), and that are arranged at a position shifted by an electrical angle of +90 degrees or an electrical angle of -90 degrees with respect to at least one of the corresponding stator main poles (A1, A2, B1, B2, C1, C2), permitting to suppress a second harmonic wave with respect to the output signals for the respective phase; and a detection circuit that converts resolver current signals for the respective phases, which are output by connecting in series the exciting coils (L2, L4, L6, L8, L10, L12) wound around the corresponding stator main poles (A1, A2, B1, B2, C1, C2) to the exciting coils (L1, L3, L5, L7, L9, L11) wound around the corresponding stator interpoles (IA1, IA2, IB1, IB2, IC1, IC2), into resolver voltage signals by inputting the resolver current signals to a current voltage converter via respective three wires, and then subjects the resolver voltage signals to three-phase/two-phase conversion to obtain two-phase resolver signals. a stator core including a plurality of stator main poles (A1, A2, B1, B2, C1, C2), the number of which is an even multiple of three that is the number of phases, and that are arranged along a circumferential direction of a ring-shaped stator base such that respective exciting coils (L1 to L12) output three-phase output signals each of which is shifted by an electrical angle of +120 degrees or an electrical angle of -120 degrees in response to a one-phase excitation input signal; and a rotor core (12, 12A) supported so as to be freely rotatable with respect to the stator core and configured such that a reluctance component in a gap between the rotor core (12, 12A) and the stator core changes in accordance with a relative angle position to the stator core, the resolver device characterized by: a plurality of stator interpoles (IA1, IA2, IB1, IB2, IC1, IC2) for the respective phases that are included in the stator core, that are wound around by respective exciting coils (L1, L3, L5, L7, L9, L11) connected in series to the exciting coils (L2, L4, L6, L8, L10, L12) wound around the corresponding stator main poles (A1, A2, B1, B2, C1, C2), and that are arranged at a position shifted by an electrical angle of +90 degrees or an electrical angle of -90 degrees with respect to at least one of the corresponding stator main poles (A1, A2, B1, B2, C1, C2), permitting to suppress a second harmonic wave with respect to the output signals for the respective phase; and a detection circuit that converts resolver current signals for the respective phases, which are output by connecting in series the exciting coils (L2, L4, L6, L8, L10, L12) wound around the corresponding stator main poles (A1, A2, B1, B2, C1, C2) to the exciting coils (L1, L3, L5, L7, L9, L11) wound around the corresponding stator interpoles (IA1, IA2, IB1, IB2, IC1, IC2), into resolver voltage signals by inputting the resolver current signals to a current voltage converter via respective three wires, and then subjects the resolver voltage signals to three-phase/two-phase conversion to obtain two-phase resolver signals. a plurality of stator interpoles (IA1, IA2, IB1, IB2, IC1, IC2) for the respective phases that are included in the stator core, that are wound around by respective exciting coils (L1, L3, L5, L7, L9, L11) connected in series to the exciting coils (L2, L4, L6, L8, L10, L12) wound around the corresponding stator main poles (A1, A2, B1, B2, C1, C2), and that are arranged at a position shifted by an electrical angle of +90 degrees or an electrical angle of -90 degrees with respect to at least one of the corresponding stator main poles (A1, A2, B1, B2, C1, C2), permitting to suppress a second harmonic wave with respect to the output signals for the respective phase; and a detection circuit that converts resolver current signals for the respective phases, which are output by connecting in series the exciting coils (L2, L4, L6, L8, L10, L12) wound around the corresponding stator main poles (A1, A2, B1, B2, C1, C2) to the exciting coils (L1, L3, L5, L7, L9, L11) wound around the corresponding stator interpoles (IA1, IA2, IB1, IB2, IC1, IC2), into resolver voltage signals by inputting the resolver current signals to a current voltage converter via respective three wires, and then subjects the resolver voltage signals to three-phase/two-phase conversion to obtain two-phase resolver signals.