Inverter device capable of appropriately fixing a power module having a switching element and a smoothing capacitor in a limited region

An inverter device, which includes:

• a power module that has a positive terminal connected to a positive electrode of a DC power supply and a negative terminal connected to a negative electrode of the DC power supply, and that forms at least one arm formed by series connection of at least one switching element connected to the positive terminal and at least one switching element connected to the negative terminal;
• and a smoothing capacitor that is connected between the positive electrode of the DC power supply and the negative electrode of the DC power supply, and which converts electric power between DC power and AC power, comprising:
• a plate-like DC bus board which has a positive electrode pattern connected to the positive electrode of the DC power supply, and a negative electrode pattern connected to the negative electrode of the DC power supply, and in which a positive-side terminal of the smoothing capacitor is electrically connected to the positive electrode pattern, a negative-side terminal of the smoothing capacitor is electrically connected to the negative electrode pattern, and to which the smoothing capacitor is fixed;
• and
• a fixing member that maintains a relative positional relation between the DC bus board and a plurality of the power modules provided corresponding to a plurality of the arms corresponding to a plurality of phases of an alternating current, wherein
• the DC bus board has a plurality of connection positive terminals that are electrically connected to the positive electrode pattern and that are respectively electrically connected to the positive terminals of the plurality of power modules, and a plurality of connection negative terminals that are electrically connected to the negative electrode pattern and that are respectively electrically connected to the negative terminals of the plurality of power modules, and
• the connection positive terminal and the positive terminal which correspond to each other are fastened to the fixing member by a common fastening member, and the connection negative terminal and the negative terminal which correspond to each other are fastened to the fixing member by a common fastening member, so that the DC bus board and the power modules are fixed to the fixing member.