A manufacturing method of an electric pump, the electric pump including: an impeller; a rotor connected to the impeller; a housing housing the rotor; a stator surrounding an outer surface of the housing; and a bus bar unit, the bus bar unit including: a first ring portion (82u, 82v, 82w) formed into a substantial C shape; a second ring portion (82n, 82u, 82v) formed into a substantial C shape and located radially outward from the first ring portion (82u, 82v, 82w); a plurality of connecting portions (88u1, 88u2, 88u3, 88u4, 88u5, 88v1, 88v2, 88v3, 88v4, 88w1, 88w2, 88w3, 88w4) extending radially outward from the first ring portion (82u, 82v, 82w) and being connected to the second ring portion (82n, 82u, 82v); a first hook portion (84u, 84v, 84w) extending radially outward from a radially outer periphery of the first ring portion (82u, 82v, 82w), and curving to extend radially inward; and a second hook portion (84n, 84u, 84v) extending radially outward from a radially outer periphery of the second ring portion (82n, 82u, 82v), and curving to extend radially inward, the stator including: a plurality of divided iron cores surrounding the outer surface of the housing; a plurality of divided coil bobbins respectively attached to the plurality of the divided iron cores; and a plurality of divided coils respectively wound around the plurality of the divided coil bobbins, the plurality of the divided coils including first and second divided coils, first and second extended portions (36n, 36u, 36v, 36w) respectively extended from the first and second divided coils, the manufacturing method comprising; engaging and welding the first and second extended portions (36n, 36u, 36v, 36w) with the first and second hooks (84n, 84u, 84v, 84w), respectively, and cutting the plurality of the connecting portions (88u1, 88u2, 88u3, 88u4, 88u5, 88v1, 88v2, 88v3, 88v4, 88w1, 88w2, 88w3, 88w4) after the engaging and welding. the electric pump including: an impeller; a rotor connected to the impeller; a housing housing the rotor; a stator surrounding an outer surface of the housing; and a bus bar unit, an impeller; a rotor connected to the impeller; a housing housing the rotor; a stator surrounding an outer surface of the housing; and a bus bar unit, the bus bar unit including: a first ring portion (82u, 82v, 82w) formed into a substantial C shape; a second ring portion (82n, 82u, 82v) formed into a substantial C shape and located radially outward from the first ring portion (82u, 82v, 82w); a plurality of connecting portions (88u1, 88u2, 88u3, 88u4, 88u5, 88v1, 88v2, 88v3, 88v4, 88w1, 88w2, 88w3, 88w4) extending radially outward from the first ring portion (82u, 82v, 82w) and being connected to the second ring portion (82n, 82u, 82v); a first hook portion (84u, 84v, 84w) extending radially outward from a radially outer periphery of the first ring portion (82u, 82v, 82w), and curving to extend radially inward; and a second hook portion (84n, 84u, 84v) extending radially outward from a radially outer periphery of the second ring portion (82n, 82u, 82v), and curving to extend radially inward, a first ring portion (82u, 82v, 82w) formed into a substantial C shape; a second ring portion (82n, 82u, 82v) formed into a substantial C shape and located radially outward from the first ring portion (82u, 82v, 82w); a plurality of connecting portions (88u1, 88u2, 88u3, 88u4, 88u5, 88v1, 88v2, 88v3, 88v4, 88w1, 88w2, 88w3, 88w4) extending radially outward from the first ring portion (82u, 82v, 82w) and being connected to the second ring portion (82n, 82u, 82v); a first hook portion (84u, 84v, 84w) extending radially outward from a radially outer periphery of the first ring portion (82u, 82v, 82w), and curving to extend radially inward; and a second hook portion (84n, 84u, 84v) extending radially outward from a radially outer periphery of the second ring portion (82n, 82u, 82v), and curving to extend radially inward, the stator including: a plurality of divided iron cores surrounding the outer surface of the housing; a plurality of divided coil bobbins respectively attached to the plurality of the divided iron cores; and a plurality of divided coils respectively wound around the plurality of the divided coil bobbins, a plurality of divided iron cores surrounding the outer surface of the housing; a plurality of divided coil bobbins respectively attached to the plurality of the divided iron cores; and a plurality of divided coils respectively wound around the plurality of the divided coil bobbins, the plurality of the divided coils including first and second divided coils, first and second extended portions (36n, 36u, 36v, 36w) respectively extended from the first and second divided coils, the manufacturing method comprising; engaging and welding the first and second extended portions (36n, 36u, 36v, 36w) with the first and second hooks (84n, 84u, 84v, 84w), respectively, and cutting the plurality of the connecting portions (88u1, 88u2, 88u3, 88u4, 88u5, 88v1, 88v2, 88v3, 88v4, 88w1, 88w2, 88w3, 88w4) after the engaging and welding. engaging and welding the first and second extended portions (36n, 36u, 36v, 36w) with the first and second hooks (84n, 84u, 84v, 84w), respectively, and cutting the plurality of the connecting portions (88u1, 88u2, 88u3, 88u4, 88u5, 88v1, 88v2, 88v3, 88v4, 88w1, 88w2, 88w3, 88w4) after the engaging and welding.