Abstract: A buckle device into which a tongue plate provided on a seat belt of a vehicle is to be inserted, and which detachably engages with the inserted tongue plate. The buckle device includes a hollow buckle body, an operating member configured to be operated in response to a release operation for releasing engagement between the tongue plate and the buckle device, the operating member being supported, in the buckle body, to be slidable in an insertion direction of the tongue plate, and an inertia member supported, in the buckle body, to be rotatable about a rotation center axis extending in a width direction of the tongue plate.

Abstract: A seatbelt retractor includes: a housing; a winding drum configured to wind a webbing and rotatable in a winding direction and a pull-out direction of the webbing; a lock member coupled to the winding drum to be not rotatable relative to the winding drum when a force for pulling out the webbing is less than a predetermined value and to be rotatable relative to the winding drum when the force exceeds the predetermined value; an impact energy absorber provided between the winding drum and the lock member and configured to absorb impact energy by relative rotation between the winding drum and the lock member; and a bush made of resin. The lock member includes a tubular shaft support portion, and the winding drum includes a protrusion disposed inside the shaft support portion. The bush made of resin is provided between the shaft support portion and the protrusion.