According to one embodiment, a current sensor includes a first sensor element and a power line. The first sensor element includes a first electrode, a second electrode, and a first stacked body. The first stacked body is provided between the first electrode and the second electrode. The first stacked body includes a first magnetic layer, a second magnetic layer and a first intermediate layer. The second magnetic layer is provided between the first magnetic layer and the second electrode. The first intermediate layer is provided between the first magnetic layer and the second magnetic layer. The first intermediate layer is nonmagnetic. A magnetization of the second magnetic layer changes according to a magnetic field generated by a current flowing through the power line. At least a portion of the second magnetic layer is amorphous.