In a motor driving device, an IC chip of a drive circuit for driving a motor is die-bonded to one island of a leadframe, and a diode chip of a protection diode for preventing the drive circuit from being destroyed when supplied power is connected to the IC chip with reverse polarities is die-bonded to another island of the leadframe. The supplied-power pad of the IC chip is wire-bonded to the second island, which serves as the cathode electrode of the diode chip.