An inverter-integrated electric compressor comprising a compressing mechanism portion which sucks, compresses and discharges fluid, a motor which drives the compressing mechanism portion, a body casing in which the motor is incorporated, the body casing being hermetically closed, a suction passage formed in one of ends of the body casing, and an inverter case in which an inverter for driving the motor is incorporated. At least a portion of the inverter case is closely brought into contact with and fixed to, in its axial direction, the body casing in which the suction passage is formed.