A reactor, which enables costs to be reduced while ensuring specific specifications for an electric vehicle such as an HV vehicle, is provided. The reactor for an HV vehicle includes: a reactor core in which a pair of roughly U-shaped core members, which have been integrally formed using an Fe—Si magnetic powder, are arranged in a circular shape by aligning two leg sections of each core member opposite to each other with gaps therebetween; and coils wound around the periphery of the leg sections of the core members, which are positioned opposite to each other with the gaps therebetween.