Abstract: The present invention relates to a chair position adjuster for adjustable chairs or foldable chairs. The objective of the utility model is to provide an improved chair position adjuster to overcome the shortcomings in the prior art, avoid risks of clamping hands, and realizing simple structure and lower cost. A chair position adjuster comprises a housing and an adjustment arm. The housing is installed at the lower surface of an armrest. The said adjustment arm is connected with a chair part. The said housing is internally provided with a continuous wave-shaped chute. The bottom of the said housing is transversely provided with a slit communicating with the said chute. One end of the adjustment arm is inserted into the said chute, while the other end extends out of the slit and is fixed on the chair part. The said adjustment arm moves slidably in the said chute.