To provide a one-way ratchet having an effect of further surely operating a ratchet and preventing the ratchet from easily sliding.

This one-way ratchet includes a body 11 including a first hole 13 and a second hole 14, a drive wheel 21, and a driven wheel 31. The drive wheel 21 is provided in the first hole 13. An interlocking part 23 for jointly rotating a rotating member 41 is formed at a central part of the drive wheel 21. A first tooth section 22 is provided around an outer peripheral surface of the drive wheel 21. The second hole 14 includes a shifting space 141 on one side facing to a drive direction. A stopper stage 142 formed by continuously arranging a plurality of small teeth is provided on a slant surface located at and facing the other side of the shifting space 141 of the second hole 14. The driven wheel 31 is provided in the second hole 14 of the body 11, and a second tooth section 32 for engagement with the first tooth section 22 and lock teeth 33 facing and engaged with the stopper stage 142 of the second hole 14 are provided around the outer peripheral surface thereof.