Abstract: Provided is a parallel inverter device with which, among inverter devices each including a DC/AC inverter and the like, control of a parallel operation accompanied with an increase in power capacity or the like can be easily performed without using a control line for connecting between the inverter devices. A parallel inverter device (1) includes a switcher (15) in which, on an output line to which a load (40) is connected, two MOSFETs connected in series to the load are arranged so as to face each other so that their energization directions are opposite directions. ON/OFF of each MOSFET of the switcher (15) is controlled based on a polarity of an AC voltage output from a filter circuit (10) of the parallel inverter device (1) and a direction of a current flowing to the load (40) on the output line so that a cross current is interrupted.