To provide a preventive device for pelvic organ prolapse which can be easily attached and detached by a patient himself and can further prevent stress urinary incontinence.SOLUTION: This preventive instrument 10 for pelvic organ prolapse which is inserted into the vagina and expanded and fixed in the interior, is formed in a thin-walled tubular shape made of a flexible material and has a proximal large-diameter tubular portion 11 and a rear large-diameter tube portion 12 are formed, and the front large-diameter tube portion 11 and the rear-side large-diameter tube portion 12 are connected by a small diameter connecting portion tube portion 13, and the front large portion The front end portion of the diameter tube portion 11 is formed with an opening 14 and the rear end portion of the rear large diameter cylindrical portion 12 is formed with a mirror plate portion 16 having a hole portion 15 in the center, The urethra securing concave portions 17 and 18 and the rectal securing concave portions 19 and 20 are formed at positions sandwiching the central axis from the outer periphery to the inner large diameter cylindrical portion 12 There.BACKGROUND OF THE INVENTION【課題】患者自身により容易に着脱が可能あり更に腹圧性尿失禁を予防することができる骨盤臓器脱の予防器具を提供する。【解決手段】膣内に挿入して内部で拡開して固定する骨盤臓器脱の予防器具10であって、柔軟な素材で構成された薄肉の筒状に形成され、手前側大径筒部11と、奥側大径筒部12とが形成され、手前側大径筒部11と、奥側大径筒部12との間は小径接続部筒部13で接続されており、手前側大径筒部11の手前側端部は開口14し、奥側大径筒部12の奥側側端部は中央に孔部15を備えた鏡板部16が形成されており、手前側大径筒部11及び奥側大径筒部12には、それぞれ外周から内側に向けて尿道確保用凹設部17、18と直腸確保用凹設部19、20とが中心軸を挟む位置に形成されている。【選択図】図1