Located in Usuda, Saku City, Nagano Prefecture, Tsutsumi Heart Clinic is a general internal medicine clinic that opened in November 2002 in Saku-daira, known for having Japan's highest rate of sunny days. Director Dr. Masafumi Tsutsumi brings 10 years of experience from the Department of Cardiology at Saku General Hospital, specializing in cardiovascular diseases and lifestyle-related diseases (hypertension, hyperlipidemia, diabetes, and atrial fibrillation). The clinic now covers a wide range of specialties including internal medicine, cardiology, respiratory medicine, gastroenterology, and allergy care. One distinctive feature is the clinic's sleep apnea testing equipment, allowing them to address often-overlooked sleep disorders. Additionally, the clinic offers endoscopic and ultrasound examinations aimed at early cancer detection, treatment for allergic conditions such as bronchial asthma and hay fever, smoking cessation programs, various vaccinations, and lifestyle disease screenings. With English language support available, the clinic provides an accessible environment for international residents and visitors. The facility includes parking for 15 vehicles and is barrier-free, making it easily accessible for diverse patients. Through collaboration with JA Nagano Kouseiren Saku General Hospital and the Saku Medical Association, the clinic ensures continuity with the local healthcare network.