Provided is a penile erection assistance tool that can provide a ring body which is capable of maintaining a high degree of airtightness of a container, can be interchanged easily, and feels good to use. This penile erection assistance tool is provided with: a cylindrical container having an insertion opening at one end and an air discharge opening at the other end； and a ring body configured so that an outer circumferential rim thereof is elastically and detachably fitted to the insertion opening of the container, and so that a central hole thereof is introduced into the container, the penis being inserted into the central hole of the ring body and the pressure in the container being reduced by suctioning the air therein out through the air discharge opening while the ring body is fitted around the root of the penis, thereby squeezing the penis, causing blood to pool therein and effecting an erection, wherein: the ring body is configured by two layers of elastic members being stacked together, and is configured so that the elastic members are bonded to one another and extend along the outer circumferential rim, the two layers of elastic members extend while repeatedly contacting and separating from each other at intervals in the portion that is introduced into the container, and the two layers of elastic members are in close contact with each other at the tip； and a protrusion is formed on the elastic members at a position within a prescribed distance from the insertion opening.L'invention concerne un outil d'assistance à l'érection pénienne qui peut utiliser un corps annulaire en mesure de maintenir un degré élevé d'étanchéité à l'air d'un récipient, qui peut être facilement remplacé et qui a une bonne sensation d'utilisation. Ledit outil d'assistance à l'érection pénienne est pourvu : d'un récipient cylindrique ayant une ouverture d'insertion à une extrémité et une ouverture d'évacuation d'air à l'autre extrémité ； et un corps annulaire conçu de telle sorte qu'un
