A three phase inverter-type generator includes an engine, an AC generator driven by the engine, a rectifier for converting the output of the AC generator into a DC voltage, a three phase inverter for converting the output of the rectifier into a three phase AC voltage, a three phase transformer connected to the output side of the three phase inverter, and a filter, whereby the three phase transformer has a primary-side connection and a secondary-side connection having a three phase connection, the secondary-side connection having first through third windings forming a star connection in which one end of each is respectively connected to a neutral point, with each having the same number of windings and a mutual phase difference of 120°.