A fake bait having an adjustment device includes a main body, an engaging member and a resistant board. The main body has an accommodation trough at a head portion thereof and an inclined board in the accommodation trough. The engaging member has a toothed section which is biased by a resilient element. The resistant board has a toothed portion to engage with the toothed section of the engaging member. The engaging member and the resistant board are received in the accommodation trough and located on the inclined board. When the resistant board is pulled, the resistant board biased by the resilient element of the engaging member is adjusted forward or backward through the teethed portion of the resistant board to engage with the teethed section of the engaging member, providing a positioning effect.
