An electric pump comprising: a housing formed with a suction port and a discharge port and equipped with an annular stator; an outer rotor formed in a cylindrical shape and rotatably disposed radially inward of the stator, wherein the outer rotor includes a plurality of permanent magnets in an outer circumferential surface of the outer rotor such that the outer rotor cooperates with the stator to define a motor section, and a plurality of plate holding grooves formed in an inner circumferential surface of the outer rotor extend in an axial direction of the outer rotor; an inner rotor provided radially inward of the outer rotor and at an eccentric location relative to the outer rotor, wherein a plurality of slots are radially formed in an outer circumferential surface of the inner roto, and a space formed between the inner rotor and the outer rotor communicates with the suction port and the discharge port; and a plurality of connecting plates each including a head portion and a radially-inner end portion, the head portion being formed in a substantially circular shape in cross section and fitted swingably into the plate holding groove, the radially-inner end portion being slidably fitted into the slot, the space being partitioned into a plurality of chambers by the plurality of connecting plates, characterized in that each of the plate holding grooves is located within a projection plane of the permanent magnet with respect to a circumferential direction of the outer rotor. a housing formed with a suction port and a discharge port and equipped with an annular stator; an outer rotor formed in a cylindrical shape and rotatably disposed radially inward of the stator, wherein the outer rotor includes a plurality of permanent magnets in an outer circumferential surface of the outer rotor such that the outer rotor cooperates with the stator to define a motor section, and a plurality of plate holding grooves formed in an inner circumferential surface of the outer rotor extend in an axial direction of the outer rotor; wherein the outer rotor includes a plurality of permanent magnets in an outer circumferential surface of the outer rotor such that the outer rotor cooperates with the stator to define a motor section, and a plurality of plate holding grooves formed in an inner circumferential surface of the outer rotor extend in an axial direction of the outer rotor; an inner rotor provided radially inward of the outer rotor and at an eccentric location relative to the outer rotor, wherein a plurality of slots are radially formed in an outer circumferential surface of the inner roto, and a space formed between the inner rotor and the outer rotor communicates with the suction port and the discharge port; and wherein a plurality of slots are radially formed in an outer circumferential surface of the inner roto, and a space formed between the inner rotor and the outer rotor communicates with the suction port and the discharge port; and a plurality of connecting plates each including a head portion and a radially-inner end portion, the head portion being formed in a substantially circular shape in cross section and fitted swingably into the plate holding groove, the radially-inner end portion being slidably fitted into the slot, the space being partitioned into a plurality of chambers by the plurality of connecting plates, characterized in that each of the plate holding grooves is located within a projection plane of the permanent magnet with respect to a circumferential direction of the outer rotor.