The personal diary and the theoretical analysis of its foundations have very little scientific literature in the framework of the literary studies. While the autobiography has received increasing attention, the personal diary is revealed as a form that has yet to take root in the canon, up to the point that their membership of the literature has frequently been challenged. This paper seeks to justify the inclusion of personal diary into the area of the literature. For it, it tries to define what in these pages is named a literary diary and to explain the possibility of reading the personal diary from the literature, which is the space where this analysis is located from a theoretical point of view. El diario personal y el análisis teórico d...