A current sensor is provided with a magnetic shield core (50) which has: a core section (51) that is disposed around a current path (60); a gap section (52), which is formed by cutting out a part of the core section (51), and which has a magnetism detection element (40) disposed therein; and two shield sections (53), which extend from the core section (51) toward the outside. The outside is opposite to inside of the core section (51) where the current path (60) is positioned, and the two shield sections (53) extend parallel to each other when the magnetism detection element (40) is disposed between the two shield sections.