The present invention relates to a ring inner diameter-adjustable multi-projection ring perineal region muscle exercising tool. The ring inner diameter-adjustable multi-projection ring perineal region muscle exercising tool is worn on the penis of a user in usual time to adjust a penis pressing degree by rolling or releasing an end or both ends of a ring inner diameter-adjustable multi-projection ring, accurately recognize and confirm correct muscle usage by recognizing penis distension caused when only perineal region muscle needed for exercise is shrunken, and induce the user to perform perineal region muscle reinforcing exercise. According to the present invention, penis compressing strength is adjusted by rolling or releasing an end or both ends of a ring inner diameter-adjustable multi-projection ring, so the ring inner diameter-adjustable multi-projection ring perineal region muscle exercising tool can be flexibly and easily applied to the penis having very variously changing erection rigidity and length due to psychological, physical, and environmental factors during usual time and even during a sexual relationship. Moreover, the ring inner diameter-adjustable multi-projection ring perineal region muscle exercising tool according to the present invention can fix a condom and is very useful to a critical dysuresia patient who needs a separate adhesive fixing tape along with an external (condom-type) catheter and to a person who wants to avoid undesirable pregnancy caused by a condom delay desorption accident in which only the penis is taken out while a condom becoming slipperier and heavier due to ejaculated semen remains in the vagina when penis erection is rapidly evanished right after final orgasm of a sexual relationship. 본 발명은 평상시에 성기에 착용하여 링내경 조절형 다중 돌기링의 끝단 또는 양쪽 끝단을 말거나 풀어서 성기의 압박 정도를 조절하면서, 운동에 필요한 회음부 근육만을 수축할 때에 생기는 음경 팽만감 자각을 통해 올바른 근육사용을 정확히 인지하고 확인하면서 회음부 근육강화운동을 할 수 있도록 유도하는 링내경 조절형 다중 돌기링 회음부 근육 운동기구를 얻기 위한 것인 바, 본 발명은 링내경 조절형 다중 돌기링의 끝단 또는 양쪽
