We studied the relationship between the coordinated precision grip force of the thumb and index finger and the positions and associated movements of the little finger. Subjects (n = 10) pinched the pinch-meter and followed the target wave, which was made by a triangular wave and two horizontal waves. When following the target wave (TW) with precision grip, subjects preformed two tasks: changing the little finger positions to neutral, flexion and extension (Task-1) and performing flexed and extended movements (Task-2). The errors between TW and the following wave resulting from precision grip with the thumb and index finger were recorded. We found that the change of the little finger position and joint movements influenced the coordinated precision grip force. Furthermore, we found a relationship between the plus or minus directions of error, and the direction of the little finger's joint movements and little finger positions. This study indicates that the little finger position influences coordinated precision grip force, but showed no involvement between the thumb and the index finger.