An in-vehicle determination has a current generation circuit and a comparison circuit. The current generation circuit is provided with a second resistance unit electrically connected on one end side to a second reference conduction path that is set to a second reference potential that is higher than a first reference potential of a first reference conduction path, and allows a current that depends on the current flowing through a first resistance unit to flow to the second resistance unit from the second reference conduction path side. The comparison circuit outputs a first signal in the case where the potential of the other end of the second resistance unit is smaller than a threshold potential that is generated with reference to the second reference potential, and outputs a second signal in the case where the potential of the other end of the second resistance unit is larger than the threshold potential.