Electric current sensor

An electric current sensor comprising an upper shield case, a lower shield case, a press-fit member and an inner member, wherein:

• the upper shield case has at least an upper surface and an upper outer peripheral portion;
• the upper surface has an opening at its inside;
• the upper outer peripheral portion extends downward in an up-down direction from an outer edge of the upper surface;
• the lower shield case has at least a lower surface and a lower outer peripheral portion;
• the lower surface has an opening at its inside;
• the lower outer peripheral portion extends upward in the up-down direction from an outer edge of the lower surface;
• at least one of the upper shield case and the lower shield case has an inner peripheral portion which extends along the up-down direction from the opening of the at least one of the upper shield case and the lower shield case;
• the upper shield case and the lower shield case form an accommodating portion;
• the press-fit member has a main portion;
• the main portion pushes both of the upper outer peripheral portion and the lower outer peripheral portion outward in a horizontal plane perpendicular to the up-down direction to integrally fix the upper shield case and the lower shield case to each other;
• the inner member comprises a coil and an electromagnetic core;
• and
• the inner member is arranged between the main portion and the inner peripheral portion in the accommodating portion.