A mounting structure for a power converter in a vehicle is provided. The power converter includes a plurality of voltage converter circuits connected in parallel, and each of the plurality of voltageconverter circuits includes a reactor, in which the power converter (10) includes: a main body (12) containing at least one of the reactors and a switching device of the voltage converter circuits; and a sub-body (13) containing remaining reactors, the sub-body being electrically connected to the main body by a cable. The main body (12) is fixed to a vehicle body via a bracket (45,46a,46b) in a front compartment such that a gap SP is provided below the main body, and the sub-body (13) is connected to a lateral side of the main body in a vehicle width direction such that a front end of the sub-body aligns with a front end of the main body.