To provide a waterproof protective device for waterproofing a catheter and its surroundings when a patient who inserts a catheter of an indwelling needle into a blood vessel bathes. Provided is a waterproof protective device which is inexpensive and easy to be attached and detached.SOLUTION: A main body 2 and an opening hollow portion 3 are formed integrally with a single material. This material has stretchability that allows attachment and detachment to / from a protective object without touching the main body 2 and the inner surface of the opening hollow portion 3 to a protected area which is a part of the outer peripheral surface of the object to be protected. The main body 2 is mounted on a pillar-shaped protected object and covers the outer circumferential surface of the object to be protected. The opening hollow portion 3 secures a protection space. The first peripheral area surrounding at least the periphery of the opening hollow portion 3 of the main body 2 in close contact with the second peripheral area surrounding the protected area in the state of being attached to the outer peripheral surface of the protection target, Prevent flooding in the space.BACKGROUND OF THE INVENTION【課題】留置針のカテーテルを血管に挿入した患者が入浴する際にカテーテルおよびその周辺を防水保護する防水保護具を提供する。安価で、かつ、着脱が容易な防水保護具を提供する。【解決手段】本体2および開口中空部3を単一の素材で一体的に形成する。この素材は、保護対象の外周面の一部である保護面積に、本体2および開口中空部3の内側表面が触れることなく保護対象への着脱を可能にする伸縮性を有する。本体2は、柱状の保護対象に装着して保護対象の外周面を覆う。開口中空部3は、保護空間を確保する。保護対象の外周面に装着された状態において、本体2のうち、少なくとも開口中空部3の周囲を囲む第1周辺領域が、保護面積の周囲を囲む第2周辺領域に密着して、外部から保護空間への浸水を防ぐ。【選択図】図1
