To provide a packaging device which can efficiently package a used medical instrument or the like individually by using a bag-like member, does not require a large installation space, and can be manufactured inexpensively.

The packaging device includes a body 1 having a slot 3 for a workpiece 2 on an upper surface, and having a control panel 1a and casters 1b mounted on an upper part and a lower part. A mouth enlarging part 6 for enlarging a bag mouth of a sterilization bag, a heat sealer 7 for welding the bag mouth of the sterilization bag, a conveying tray 8 for conveying the sterilization bag, a suction pad 9, and a chute 10 for discharging the sterilization bag with the workpiece 2 sealed therein to an external of the body 1 are arranged on an inclined table 17 in the inside of the body 1.