Provided is an article processing apparatus capable of improving waterproofness. An article processing apparatus (1) includes: a storage case (130) which stores an electric circuit portion and has an opening (131) at a side surface (130c) thereof; and a lid (140) which seals the opening (131), in which the storage case (130) has an upper surface (130a) which is inclined downward toward the side surface (130c) side, and an amount of protrusion of a lower end (E) of the upper surface (130a) from the side surface (130c) is greater than an amount of protrusion of the lid (140) from the side surface (130c).