At least eight arthropod species belonging to five taxa as flower visitors of Diospyros blancoi A. DC. were investigated in terms of their visiting frequency, activities on the flowers and pollen-bearing capacity. The main results of this study are as follows: First, thrips particularly Thrips hawaiiensis (Morgan) (Thysanoptera: Thripidae), and ants showed the highest visiting frequency; Second, the long pollination distance and the fruit-set on single female trees isolated by water barriers indicate that arboreal ants were not pollinators; Third, thrips species other than T. hawaiiensis were not observed in this study; Fourth, male flowers provided shelter (flower tube) and food (pollen) for T. hawaiiensis; Fifth, T. hawaiiensis visited both blooming and non-blooming female flowers; Finally, pollen was found only on thrips visiting either male or female flowers. The results suggest that T. hawaiiensis is the major pollinator of D. blancoi in Taiwan.