An inverter device comprising: phase sections (U1-U6, V1-V6, W1-W6) including a U-phase section (U1-U6), a V-phase section (V1-V6), and a W-phase section (W1-W6), each of which includes multiple single-phase output inverter cells connected in series, and wherein each of the single-phase output inverter cells is configured to receive input of alternating current power via a transformer (Tr); a neutral point to which an end of the series connection of each of the phase sections (U1-U6, V1-V6, W1-W6) is connected; at least two current sensors, each of which is disposed at a line between the neutral point and one of the single-phase output inverter cells at a neutral-point-side of a corresponding one of the phase sections (U1-U6, V1-V6, W1-W6) closest to the neutral point; a transformer board including a cabinet containing the transformer (Tr); an inverter board including a cabinet containing the single-phase output inverter cells, wherein the inverter board is disposed adjacent to the transformer board; and an output board including a cabinet containing a controller, wherein the output board includes a three-phase output terminal structured to be connected to a load (Motor), and is disposed adjacent to the inverter board, wherein the controller is configured to control the single-phase output inverter cells; wherein each of the lines from the single-phase output inverter cell at the neutral-point-side to the neutral point includes a part diverted from the inverter board into the cabinet of the output board; wherein each of the current sensors disposed at the corresponding lines is arranged in the cabinet of the output board and wherein each of the current sensors is a through-type current sensor. phase sections (U1-U6, V1-V6, W1-W6) including a U-phase section (U1-U6), a V-phase section (V1-V6), and a W-phase section (W1-W6), each of which includes multiple single-phase output inverter cells connected in series, and wherein each of the single-phase output inverter cells is configured to receive input of alternating current power via a transformer (Tr); a neutral point to which an end of the series connection of each of the phase sections (U1-U6, V1-V6, W1-W6) is connected; at least two current sensors, each of which is disposed at a line between the neutral point and one of the single-phase output inverter cells at a neutral-point-side of a corresponding one of the phase sections (U1-U6, V1-V6, W1-W6) closest to the neutral point; a transformer board including a cabinet containing the transformer (Tr); an inverter board including a cabinet containing the single-phase output inverter cells, wherein the inverter board is disposed adjacent to the transformer board; and an output board including a cabinet containing a controller, wherein the output board includes a three-phase output terminal structured to be connected to a load (Motor), and is disposed adjacent to the inverter board, wherein the controller is configured to control the single-phase output inverter cells; wherein each of the lines from the single-phase output inverter cell at the neutral-point-side to the neutral point includes a part diverted from the inverter board into the cabinet of the output board; wherein each of the current sensors disposed at the corresponding lines is arranged in the cabinet of the output board and wherein each of the current sensors is a through-type current sensor.