一般社団法人相続診断協会 is a leading organization dedicated to the certification, education, and support of estate planners known as "相続診断士" (Sōzoku Shindan-shi). These certified professionals are equipped to understand a wide range of inheritance-related issues and engage in public awareness initiatives concerning estate planning. The association offers a structured qualification process, whereby individuals can take exams to achieve certification as estate planners.

The exam offers flexibility in scheduling, with individuals able to choose their testing dates at over 260 nationwide locations, utilizing a Computer-Based Testing (CBT) system. Comprehensive study materials are provided, including a five-hour instructional video and textbook. The association also provides resources for continuous education and offers a membership newsletter upon certification. With a commitment to minimizing inheritance disputes and promoting "smiling inheritances," the organization plays a pivotal role in enhancing public understanding and awareness of estate planning practices in Japan.