A zooming adjustment mechanism including a holder, a zoom ring, at least two rollers, a first resilient sheet, and a second resilient sheet is provided. The zoom ring is confined to the holder and coupled to a zoom bar. The rollers are respectively confined to a groove of the holder and in contact with a bottom surface of the zoom ring. The first resilient sheet is disposed on a first side of the holder, and each end of the first resilient sheet leans against a roller. The second resilient sheet is disposed on a second side of the holder, and each end of the second resilient sheet leans against a roller. A projection lens module including the zooming adjustment mechanism is also provided.