When a front end part of an upper surface of a first upper press-fit portion is brought into contact with a boundary part between a first terminal press-fit guiding groove and a second terminal press-fit guiding groove, the position of a rectangular wire terminal is thereafter accurately corrected along the first terminal press-fit guiding groove. That is, a distance from a lower surface of a terminal main body to the upper surface of the first upper press-fit portion coincides with a height from a lower surface of a cavity main part to the upper end of the first terminal press-fit guiding groove. As a result, the first press-fit portion reaches the first terminal press-fit guiding groove and thereafter, the rectangular wire terminal is further press-fitted, and forcibly pressed against the lower surface of the cavity main part.