A power converter attached to a power unit including a motor-generator, the power unit being disposed in a power unit mounting chamber, the power unit mounting chamber having a room for disposing the power converter is adapted to be formed at a front of a vehicle and separated from a vehicle cabin by a partition wall, the power converter comprising: a high-voltage component including an electric power conversion device of a relatively high voltage, the electric power conversion device converting an electric power between a DC electric power and an AC electric power for the motor-generator; and a low-voltage component including a control device of a lower voltage than the voltage using the high-voltage component, the control device controlling the electric power conversion device, wherein an accommodation case that has a room accommodating the high-voltage component and the low-voltage component, and that is formed in the power unit mounting chamber, and, inside the accommodation case, the high-voltage component is arranged toward the front of the vehicle, and the low-voltage component is arranged toward a rear of the vehicle, the accommodation case has a high-voltage component accommodation portion and a low-voltage accommodation portion in which the high-voltage component and the low-voltage component are accommodated, respectively, and the low-voltage component is formed such that at least one of the following conditions is satisfied: a height dimension of the low-voltage component is larger than a height dimension of the high-voltage component accommodation portion; and a width dimension of the low-voltage component is larger than a width dimension of the high-voltage component accommodation portion, such that in the event that the accommodation case is fractured the low voltage component can protect the high voltage component from being externally exposed. a high-voltage component including an electric power conversion device of a relatively high voltage, the electric power conversion device converting an electric power between a DC electric power and an AC electric power for the motor-generator; and a low-voltage component including a control device of a lower voltage than the voltage using the high-voltage component, the control device controlling the electric power conversion device, wherein an accommodation case that has a room accommodating the high-voltage component and the low-voltage component, and that is formed in the power unit mounting chamber, and, inside the accommodation case, the high-voltage component is arranged toward the front of the vehicle, and the low-voltage component is arranged toward a rear of the vehicle, the accommodation case has a high-voltage component accommodation portion and a low-voltage accommodation portion in which the high-voltage component and the low-voltage component are accommodated, respectively, and the low-voltage component is formed such that at least one of the following conditions is satisfied: a height dimension of the low-voltage component is larger than a height dimension of the high-voltage component accommodation portion; and a width dimension of the low-voltage component is larger than a width dimension of the high-voltage component accommodation portion, such that in the event that the accommodation case is fractured the low voltage component can protect the high voltage component from being externally exposed.