Current sensor and method of manufacturing insert-molded component

A current sensor comprising:

• a busbar extending in a first direction perpendicular to a second direction;
• a magnetic sensor disposed on one side of the busbar in a third direction perpendicular to the first direction and the second direction so as to face the busbar;
• a magnetic shield formed of a bent metal plate having a base plate portion disposed on another side of the busbar opposite to the one side in the third direction so as to face the busbar, the bent metal plate having:
• plate surfaces having a normal line in a thickness direction of the bent metal plate and provided with rust-prevention properties;
• and
• side surfaces having a normal line in a direction perpendicular to the thickness direction and provided with no rust-prevention properties;
• and
• a case accommodating the busbar, the magnetic sensor, and the magnetic shield therein, the case including an insert-molded section in which at least a part of the magnetic shield is insert-molded, the insert-molded section having a plurality of holes in which some surfaces of the magnetic shield are exposed as exposed areas, the plurality of holes including:
• first holes exposing first areas of the plate surfaces facing the first direction;
• second holes exposing second areas of the plate surfaces facing the second direction;
• and
• third holes exposing third areas of the plate surfaces facing the third direction,
• wherein the base plate portion has;
• a base plate surface having a normal line in the third direction;
• and at least one of:
• a first side surface having a normal line in the first direction;
• and
• a second side surface having a normal line in the second direction,
• wherein the magnetic shield further comprises:
• first extending portions each extending in the thickness direction of the bent metal plate from ends of the bent metal plate in the first direction, each first extending portion having a first plate surface having a normal line in the first direction;
• and
• second extending portions each extending in the third direction from ends of the base plate portion in the second direction and having a second plate surface having a normal line in the second direction,
• wherein the first areas are portions of the first plate surface, and the second areas are portions of the second plate surface,
• and wherein at least one of the ends of the bent metal plate in the first direction and the ends of the base plate portion in the second direction include:
• portions forming the side surfaces;
• and
• portions from which the first or the second extending portions extend to form the first or the second plate surface.