A seatbelt buckle structure having: a buckle portion which a tongue plate, through which a seatbelt is inserted, is reattachable; a hollow boot portion; at whose distal end portion the buckle portion is installed; and that supports the buckle portion in an erect state by rigidity of the boot portion; a webbing portion provided at an interior of the boot portion; that connects a vehicle body and the buckle portion; that makes movement, in a vehicle vertical direction, of the boot portion possible; and that, when external force from above is inputted to the buckle portion, moves the boot portion and the buckle portion downward in the vehicle vertical direction; and an elastic member that is provided at the interior of the boot portion; that connects the boot and webbing portions; and at which elastic energy accumulates when external force from above is inputted to the buckle and boot portions.