Is the Christian`s work for culture a part of mission? A clear answer to this question is important. For many Christians think that the Christian`s work for culture does not belong to mission. This understanding is related to a traditional concept of mission which was understood as evangelism. For this, some Christians who work in the area of culture do not think their works as missionary affairs, so they think they do not have any meaning in their lives or are worthy. Many local churches also have a tendency to be stingy in supporting and sending a christian to work for culture. Therefore this study aims to accurately point out that the Christian`s work for culture does belongs(is a part of) to mission. The reasons why the Christian`s work for culture belongs to mission are as follows. First, it belongs to the cultural mandate which was given to Christians. Even though this mandate was given to men at first, but after men sinned, Christians who were born again in Jesus can be accomplished it. Especially by the modern concept of mission as a comprehensive one, the cultural mandate is included in mission. Second, the Christian`s work for mission belongs to the expansion of the Kingdom of God as the aim of mission. It is justifiable for the work relating to the aim of mission to belong to mission. Third, the Christian`s work for culture belongs(is a part of) to various means of mission. In fact, without cultural means, it is impossible for mission to be accomplished. Therefore it is clear for the Christian`s work for culture to be included in mission.