A power conversion device for a vehicle, may include a power conversion module assembly having a capacitor configured to receive a direct current (DC) current from a battery of the vehicle, a power conversion module configured to convert the DC current supplied from the capacitor, into an alternating current (AC) current, and a control unit connected to the power conversion module and configured to control the power conversion module; a housing assembled with the power conversion module assembly; and an output terminal assembly including a plurality of output terminals through which the AC currents converted through the power conversion module assembly are output, a core, and a Hall integrated circuit (IC) configured to detect a variation in magnetic flux of the core when the AC currents flow in the output terminals and measure the AC currents of the output terminals.