In an inverter integrated motor apparatus, a cylindrical base frame has an inverter unit accommodating section. The inverter unit has a plurality of control substrates and a plurality of power modules which are provided on the control substrates. In the inverter unit accommodating section, a plurality of openings are provided at intervals in the circumferential direction. A rib section is formed between mutually adjacent openings. The openings are covered by the plurality of heat sinks. The power modules and control substrates are disposed on the inside of the heat sinks.