Abstract: Interest in ecosystems and nature has become an important element of interior design, which is a basic necessity in human societies to improve physical and mental health, productivity and well-being. Designing residential units that do not satisfy users' social, recreational and behavioral needs has negative effects on these individuals. Interior design plays a fundamental role in treating the phenomenon of sick residential building syndrome and human interaction with the space in which they exist in its three aspects: intellectual, material and psychological, which is what the Ikigai philosophy calls for, a Japanese philosophy that calls for a reason to live so that the individual has a goal in life that makes it stress-free and happy. The Ikigai philosophy aims to better understand space as a result of a passion in the person himself to achieve the best in his life, increase productivity and reduce mental stress while taking into account the economic, functional and human dimensions. Ikigai also helps designers to design well and optimally functionally and aesthetically (form and content), encouraging the designer to think from the perspective of the user's needs and design the space accordingly.