A current sensor includes a primary conductor through which a current to be measured flows and a first magnetic sensor and a second magnetic sensor that each detects an intensity of a magnetic field generated by the current flowing through the primary conductor. The current is diverted into two flow channels and flows through the primary conductor in a length direction of the primary conductor. The primary conductor includes an arch portion that extends in the length direction while bending to project in one thickness direction of the primary conductor, and defines one of the two flow channels. The first magnetic sensor is disposed on an inner side of the arch portion and is located on a side of an undersurface of the primary conductor. The second magnetic sensor is located on a side of a surface of a portion of the primary conductor which defines the other one of the two flow channels.