There is provided an instrument for preventing male urinary incontinence that is safe and sanitary, and can be equipped easily and correctly, while the skin is prevented from being lodged in the instrument.The urinary incontinence prevention instrument 1 for males of the present invention includes: an annular part 10 made by annularly forming a portion of a belt-like component 11； a convex part 20 for pressing the urethra 101, convex parts attached to the inner circumference surface side of the annular part； and an adjusting mechanism 40 for adjusting the diameter of the annular part. The instrument includes a lodge-proof prevention component 50 having a hole 51 for passing the belt-like component. The lodge-proof prevention component, positioned between the penis and the adjustment mechanism, prevents the skin of the penis 100 from being lodged in the adjustment mechanism.
