To provide an inverter device with improved safety through space saving and cost reduction.

An input connection part 1a is incorporated into an inverter device 1. The input connection part 1a connects the DC power supply of a solar cell or the like directly, a power conversion part 1b, and the inverter device, and has a capacitor 25 that is a filter for noise prevention, a current fuse 27 that prevents a short-circuiting current from flowing when a surge absorber 5 fails, and a temperature fuse 26, thus saving space and reducing cost, to reduce noise outflow from the connection part effectively, and preventing the short-circuiting current from flowing continuously, when a lighting surge protection means breaks down.