This study aims to analyze the current status of the public guardianship program for individuals with dementia from the perspective of decision-making support and propose measures for improvement. Specifically, the study seeks to enhance the protection of individuals with dementia and strengthen their autonomy. To achieve this, it identifies key issues in the current guardianship system and suggests improvements, including redefining the concept of decision-making support for individuals with dementia, reinforcing systematic approaches, enhancing the expertise of guardians and improving the educational system, and establishing guidelines for the roles and authority of guardians.