There is provided an integrated electric compressor having a circuit configuration capable of decreasing the size thereof while restraining current ripples. In an inverter of the electric compressor, by providing a capacitor 13 and a reactor 14 between a power source and an inverter board 12, the ripples of a driving voltage is restrained, and a motor can be driven with high efficiency and the size of a housing can be decreased. Further, by connecting the capacitor 13 and the reactor 14 to a power board 16 by using a bus bar 23, the voltage ripple restraining effect is further increased, and the capacitor 13 and the reactor 14 are unitized integrally by the bus bar 23 to improve the assembling workability of the power board 16.