This paper aims to make clear what is property right on Tanzanian land prescribed in “Village Land Act, 1999”. Through comparative study with the Theory of “A Group of Householders Using the Commons as a Mini-Corporate Body” Kato (1996), it seems that Village Land Act has structure of commons theory having frame of trust. Then its purpose is expected to restraint on marketability of village land to maintain safety net for village community. Not apply to only African countries, this kind of property right structure will be applicable to other countries having own customary land right. Appropriate strength of traditional land right can be useful way to balance between demand on marketability and conservation of local people’s safety net.