An important question is to know why the didactics of mathematics (DM) goes from being only teaching techniques to consolidate as a science and also to locate what kind of science it is. The objective of this article is, through a modern classification of sciences, such as the theory of categorial closure, to locate the DM. Likewise, a very brief summary of the theory of categorial closure is made, and it is argued why DM belongs to the human sciences and why it is not a technique.