Provided is a pressure reducing device capable of obtaining stimulation and tightening force rich in change due to appropriate pressure by adjusting the pressure in a container as a pressure source that is a source of stimulation and tightening force for a penis. An ejaculation facilitating device comprising an ejaculation facilitator 10 made of a gel-like resin having an insertion space 15 and a valve portion 10a capable of communicating inside and outside with the insertion space, and a container 2 for housing the ejaculation facilitation device. 1 is a pressure reducing device 50 that is attached to 1 and depressurizes the inside of a container, and includes a negative pressure introducing portion 55 that communicates with a vent hole 3b provided in the container, a negative pressure introducing portion, and a vent hole. A negative pressure generating unit 53 that generates a negative pressure to be introduced into the container, and a negative pressure adjusting unit 60 that adjusts the negative pressure supplied from the negative pressure introducing unit into the container.ペニスに対する刺激や締め付け力の元となる圧力源として、容器内の圧力を増減調整することによって、適正圧による変化に富んだ刺激、締め付け力を得ることができる減圧装置を提供する。挿入空所１５を有すると共に該挿入空所に内外を連通可能とするバルブ部１０ａを有したゲル状樹脂製の射精促進具１０、及び該射精促進具を収容する容器２を備えた射精促進装置１に装着されて容器内を減圧する減圧装置５０であって、容器に設けた抜気穴３ｂと連通する負圧導入部５５と、負圧導入部、及び抜気穴を経由して容器内に導入する負圧を生成する負圧生成部５３と、該負圧導入部から容器内に供給される負圧を調整する負圧調整部６０と、を備えた。
