A urinary incontinence prevention instrument for males includes: an annular part made by forming a portion of a belt-like component; a convex part for pressing the urethra attached to the inner circumference surface side of the annular part; an adjustment mechanism for adjusting the diameter of the annular part; and a pinching-prevention component having a hole for passing the belt-like component, a lower part of the pinching-prevention component is positioned between the penis and the adjustment mechanism, preventing the skin of the penis from being pinched in the adjustment mechanism, the adjustment mechanism is located inside the hole, and both ends of the belt-like component pass through the inside of the hole and penetrate an upper part of the pinching-prevention component, the lower part of the pinching-prevention component and the convex part for pressing the urethra are at positions facing each other with the penis sandwiched in between.