Buckle for Seatbelt Device

A buckle for a seatbelt apparatus comprising:

• a buckle stay that has a fixation portion provided at a base end of the buckle stay and adapted to be fixed to a vehicle body, and a coupling plate portion provided at a leading end of the buckle stay and having a first through-hole;
• a buckle base having a bottom plate portion and a pair of side plate portions standing up from opposite side edges of the bottom plate portion, the buckle base also having a second through-hole formed at one end of the bottom plate portion along a length direction of the bottom plate portion;
• a support shaft inserted through the first and the second through-holes in the coupling plate portion of the buckle stay and at the one end of the bottom plate portion, the support shaft being loosely inserted through the first through-hole in the coupling plate portion, to allow the buckle base to be coupled to the buckle stay so as to be able to tilt with respect to the buckle stay through a predetermined angle in a first direction perpendicular to a plate surface of the bottom plate portion and so as to be able to pivot, with respect to the buckle stay, through a predetermined angle in a second direction parallel to the plate surface of the bottom plate portion;
• an elastic member that when the buckle base tilts in the first direction and pivots in the second direction, pushed by the buckle stay and elastically deformed so as to return the buckle base from a deflected position to an original position,
• the support shaft having a pair of arm portions provided at an upper portion of the support shaft and extending in a lateral direction, and
• tip portions of the pair of arm portions are coupled into respective engagement grooves formed in the pair of side plate portions of the buckle base.