Functional near-infrared spectroscopy (fNIRS) is a new brain imaging technology that has great potential to the easy measuring method as compared with fMRI and PET. However fNIRS measurements require an annoying task to fix many optical fibers on a subject's head. Each optical fiber must be fixed on the skin directly so as to not overlap with hair because the hair interferes with the near-infrared light and will decrease the signal to noise ratio. This study developed an automatic hair mover to reduce the cost of fixing optical fibers.