ELECTRIC MOTOR DRIVE DEVICE

An object of the present invention is to provide a motor driving device including an inverter that can achieve impedance matching to prevent reflection of current and voltage even when being influenced by a surrounding conductor, magnetic material, or dielectric material. The motor driving device of the present invention includes: a first motor (3A) and a second motor (3B); a first power line (41) for supplying driving power to the first motor (3A); a second power line (42) for supplying driving power to the second motor (3B); a first inverter circuit (15A) configured to supply the driving power to the first power line (41); a second inverter circuit (15B) configured to supply the driving power to the second power line (42); transmission lines (44u, 44v, 44w) including a pair of a U-phase line (41u) and a U'-phase line (42u), a pair of a V-phase line (41v) and a V'-phase line (42v), and a pair of a W-phase line (41w) and a W'-phase line (42w); and an impedance circuit (51) impedance-matched to the transmission lines (44u, 44v, 44w). Each of the transmission lines (44u, 44v, 44w) is arranged via an insulator.