An output current synthesizer configured to synthesize output currents output from a plurality of power inverter circuits converting direct current power to alternating current power and configured to output the synthesized output currents as synthesized current having a predetermined frequency, the output current synthesizer comprising: a plurality of pairs of conductors (U,V) in which each pair of conductors (U,V) comprising one conductor and another conductor is connected to its corresponding power inverter circuit, and to which the output currents output from each of the plurality of power inverter circuits flow, a corresponding reactor (310, 310A-310E) provided on each of the plurality of pairs of conductors (U, V), each of the plurality of reactors (310, 3 10A-3 10E) having a configuration that generates a magnetic flux based on a difference between a value of current flowing to one conductor of the corresponding pair of conductors (U,V) and a value of current flowing to another conductor of the corresponding pair of conductors (U,V) to reduce the difference between the value of current flowing to the one conductor and the value of the current flowing to the another conductor; a pair of conductive members to which the plurality of pairs of conductors (U,V) are connected; and a pair of output terminals which is provided on the pair of conductive members and configured to output the synthesized currents, wherein an inductance between connecting positions of the pair of conductors (U,V) which is connected at a position farthest away from the pair of output terminals, from among the plurality of pairs of conductors (U,V), and the pair of output terminals is defined as a reference inductance, wherein the plurality of pairs of conductors (U,V) have an inter-conductor distance correlated to a difference of the inductance between the corresponding connecting positions of the plurality of pairs of conductors (U,V) and the pair of output terminals, and the reference inductance, the correlation being such as to prevent the occurrence of a variation in the output current of each of the power inverter circuits, characterised in that each of the reactors (310, 310A-310E) has a first core member (401, 411, 421, 431, 441) and a second core member (402, 412, 422, 432, 442) that are mutually combined and form a ring into which the pair of conductors (U, V) are insertable, wherein the ring includes two arcs (Arc1, Arc2) extending in a separating direction of the pair of conductors (U, V) on a circumference thereof, and wherein the first core member (401, 411, 421, 431, 441) and the second core member (402, 412, 422, 432, 442) are separatable in each of the two arcs (Arc1, Arc2) in the separating direction with a surface (S1-S4) intersecting the arcs (Arc1, Arc2) as a boundary, whereby the first core member and the second core member are configured to be separated depending on the inter-conductor distance in the separating direction. a plurality of pairs of conductors (U,V) in which each pair of conductors (U,V) comprising one conductor and another conductor is connected to its corresponding power inverter circuit, and to which the output currents output from each of the plurality of power inverter circuits flow, a corresponding reactor (310, 310A-310E) provided on each of the plurality of pairs of conductors (U, V), each of the plurality of reactors (310, 3 10A-3 10E) having a configuration that generates a magnetic flux based on a difference between a value of current flowing to one conductor of the corresponding pair of conductors (U,V) and a value of current flowing to another conductor of the corresponding pair of conductors (U,V) to reduce the difference between the value of current flowing to the one conductor and the value of the current flowing to the another conductor; a pair of conductive members to which the plurality of pairs of conductors (U,V) are connected; and a pair of output terminals which is provided on the pair of conductive members and configured to output the synthesized currents, wherein an inductance between connecting positions of the pair of conductors (U,V) which is connected at a position farthest away from the pair of output terminals, from among the plurality of pairs of conductors (U,V), and the pair of output terminals is defined as a reference inductance, wherein the plurality of pairs of conductors (U,V) have an inter-conductor distance correlated to a difference of the inductance between the corresponding connecting positions of the plurality of pairs of conductors (U,V) and the pair of output terminals, and the reference inductance, the correlation being such as to prevent the occurrence of a variation in the output current of each of the power inverter circuits, characterised in that each of the reactors (310, 310A-310E) has a first core member (401, 411, 421, 431, 441) and a second core member (402, 412, 422, 432, 442) that are mutually combined and form a ring into which the pair of conductors (U, V) are insertable, wherein the ring includes two arcs (Arc1, Arc2) extending in a separating direction of the pair of conductors (U, V) on a circumference thereof, and wherein the first core member (401, 411, 421, 431, 441) and the second core member (402, 412, 422, 432, 442) are separatable in each of the two arcs (Arc1, Arc2) in the separating direction with a surface (S1-S4) intersecting the arcs (Arc1, Arc2) as a boundary,