An electrical current sensor includes a magnetic detection element whose characteristics are changed by an inductive magnetic field from a current to be measured, a plurality of coils that are connected in series with each other and which are arranged in the vicinity of the magnetic detection element, and generates a canceling magnetic field for canceling the inductive magnetic field by a feedback current flowing in the coils, and a switch circuit that selects a coil electrically connected with an input terminal and/or an output terminal of the feedback current from the plurality of coils, and controls a coil for allowing the feedback current to flow.