A motor driving system includes an AC power supply 1, an AC reactor 2, a power converter 3 and a motor 4. A microsurge suppressor 5 is inserted on a power supply line from the power converter 3 to the motor 4 and the similar microsurge suppressor 6 is inserted on a power supply line from the AC reactor 2 to the power converter 3. The microsurge suppressor 5 includes a multi-layer printed wiring board having two terminals connected to the power converter 3 and the motor 4 and a capacitor for bypassing a surge, and the terminal 4 on the side of the motor of the multi-layer printed wiring board is directly connected to a terminal of the motor 4. The capacitor for bypassing a surge is connected between the terminal of the motor 4 and the end on the side of a second terminal of second wiring.