A sealing apparatus includes an adhesive tape applying mechanism disposed at least below a transport path along which a workpiece is horizontally transported. The adhesive tape applying mechanism includes an adhesive tape roll RT and an applicator unit 10. An adhesive tape drawn from the adhesive tape roll RT is guided to and wound around an applicator roller 25 of the applicator unit, to be applied continuously to surfaces of the workpiece transported along the transport path. The adhesive tape applying mechanism disposed below the transport path is supported to be vertically pivotable about a pivotal axis x between a tape applying position and an adhesive tape roll changing position exposed above the transport path.