Electrical connector having a housing and a retainer

A connector comprising:

• a housing that receives at least one electrical terminal in an insertion direction, said housing having an outer surface;
• a retainer that can be installed on said housing by a motion toward said housing in a direction substantially perpendicular to said insertion direction, the retainer including a plate-shaped body, a pair of reinforcing wall portions formed at respective ends of said plate-shaped body, at least one removal prevention portion projecting from the plate-shaped body between the pair of reinforcing wall portions that prevents the at least one electrical terminal from being removed from the housing, at least one locking piece that locks the retainer in the housing, said reinforcing wall portions projecting from said plate-shaped body in a direction generally parallel to the direction of projection of said at least one removal prevention portion,
• said retainer being movable by said motion from a temporary position at which the retainer does not prevent insertion and removal of said at least one terminal into or out of said housing, to a locking position at which said at least one removal prevention portion prevents said at least one terminal from being removed from a predetermined position within the housing, a surface of said plate-shaped body being parallel with a proximate portion of said outer surface of said housing when said retainer is in said locking position,
• wherein said reinforcing wall portions are elastically flexible outward and slidingly contact said outer surface of said housing as said retainer moves from said temporary position to said locking position;
• and
• at least one recessed portion that accommodates a respective said reinforcing wall portion formed on said outer surface of said housing, in a region of the outer surface of the housing on which the respective reinforcing wall portion slides.