It is a problem of the present invention to provide an inverter device whose current detection precision is improved by checking variations in the distribution of current flowing in a shunt resistor without using a separate member. In a printed board (40) of an inverter device (20), a first conductive pattern component (51) connected to a shunt resistor (31) includes a first central region (510), a first right-side protruding region (511) that juts out on the right side from the first central region (510), and a first left-side protruding region (512) that juts out on the left side from the first central region (510). The ratio SA2/SA1 of the area SA2 of the first left-side protruding region (512) to the area SA1 of the first right-side protruding region (511) is set in the range of 0.6 to 1.6, whereby variations in the distribution of current flowing in the shunt resistor (31) can be checked.