Abstract: A seat belt position adjuster includes a guide rail attached to a vehicle body and a slider slidably provided to the guide rail. The slider swingably supports a belt anchor that guides a seat belt. The slider includes a boss portion that supports the belt anchor, and slides with respect to the guide rail to adjust the position of the seat belt. The boss portion includes an inner diameter that is kept constant between a base portion and a leading end portion of the boss portion, and an outer diameter that is continuously reduced from the base portion toward a leading end of the boss portion.

Abstract: To provide a seat-belt guide anchor that has a simple structure, is small, can be formed from a metal flat plate, does not need heat treatments, and therefore can provide a reduction in the production man-hours and the production cost. A seat-belt guide anchor is formed from a metal flat plate and includes a flat-plate-like mounting portion for attachment to a vehicle body, and a flat-plate-like belt guide portion having a belt guide hole. A flange-like outer circular protrusion is provided on the entire outer edge of a portion including the mounting portion and the belt guide portion and is formed by bending the outer edge. A flange-like inner circular protrusion is provided on the entire inner edge of the belt guide hole of the belt guide portion and is formed by bending the inner edge.

Abstract: A webbing insertion member in which a webbing hardly shifts within an opening during the operation of a pretensioner mechanism. The insertion member includes a bearing portion and an opening through which the webbing passes. In order to prevent the shifting of the webbing in the longitudinal direction of the opening, the length of the opening is substantially the same or slightly greater than the width of the seat belt. As a result, the left and right sides of the webbing confront the ends of the opening to thereby prevent the webbing from shifting laterally in the opening. An effective angle between the bearing portion and a sidewall of the opening is between a range of 50 to 70 degrees to limit the displacement of the webbing.