An inverter control board that is configured to be connected to an inverter for performing conversion between direct current power and multiple-phase alternating current power and where a drive control circuit for driving and controlling the inverter is formed, wherein the inverter has arms, each arm provided for one alternating current phase and comprising a series circuit of a high-side switching element to be connected to a direct-current positive electrode and a low-side switching element to be connected to a direct-current negative electrode, a low-voltage region and a high-voltage region are formed on the board as regions where circuits are arranged, the circuit arranged in the high-voltage region has a higher operating voltage than the circuit arranged in the low-voltage region, the high-voltage region includes a plurality of high-side high-voltage regions, each configured to be connected to the high-side switching element of a corresponding phase, the high-voltage region includes a plurality of low-side high-voltage regions, each configured to be connected to the low-side switching element of a corresponding phase, an insulation region is formed on the board and electrically configured to insulate the low-voltage region, each of the high-side high-voltage regions, and each of the low-side high-voltage regions from one another, the circuit in the low-voltage region and the circuit in each of the high-side high-voltage regions are connected via a high-side connection circuit included in a connection circuit across the insulation region and that transmits a signal in an electrically insulated state, the circuit in the low-voltage region and the circuit in each of the low-side high-voltage regions are connected via a low-side connection circuit included in the connection circuit and that transmits a signal in an electrically insulated state, and characterized in that a voltage detection circuit for detecting a direct-current-side voltage (Vdc) of the inverter is arranged between the high-side connection circuit and the low-side connection circuit that are adjacent to each other, and the high-side connection circuits and the low-side connection circuits of the multiple phases are arranged in a line, wherein each of the high-side connection circuits and each of the low-side connection circuits includes at least a drive circuit for transmitting a switching control signal from the low-voltage region to the high-voltage region and a drive power supply for supplying electric power to the drive circuit, and the voltage detection circuit, the drive circuits and the drive power supplies are arranged along a direction in which the high-side connection circuits and the low-side connection circuits are arranged. the inverter has arms, each arm provided for one alternating current phase and comprising a series circuit of a high-side switching element to be connected to a direct-current positive electrode and a low-side switching element to be connected to a direct-current negative electrode, a low-voltage region and a high-voltage region are formed on the board as regions where circuits are arranged, the circuit arranged in the high-voltage region has a higher operating voltage than the circuit arranged in the low-voltage region, the high-voltage region includes a plurality of high-side high-voltage regions, each configured to be connected to the high-side switching element of a corresponding phase, the high-voltage region includes a plurality of low-side high-voltage regions, each configured to be connected to the low-side switching element of a corresponding phase, an insulation region is formed on the board and electrically configured to insulate the low-voltage region, each of the high-side high-voltage regions, and each of the low-side high-voltage regions from one another, the circuit in the low-voltage region and the circuit in each of the high-side high-voltage regions are connected via a high-side connection circuit included in a connection circuit across the insulation region and that transmits a signal in an electrically insulated state, the circuit in the low-voltage region and the circuit in each of the low-side high-voltage regions are connected via a low-side connection circuit included in the connection circuit and that transmits a signal in an electrically insulated state, and characterized in that a voltage detection circuit for detecting a direct-current-side voltage (Vdc) of the inverter is arranged between the high-side connection circuit and the low-side connection circuit that are adjacent to each other, and the high-side connection circuits and the low-side connection circuits of the multiple phases are arranged in a line, wherein each of the high-side connection circuits and each of the low-side connection circuits includes at least a drive circuit for transmitting a switching control signal from the low-voltage region to the high-voltage region and a drive power supply for supplying electric power to the drive circuit, and the voltage detection circuit, the drive circuits and the drive power supplies are arranged along a direction in which the high-side connection circuits and the low-side connection circuits are arranged.