Chiba Rosai Hospital, part of the Japan Organization of Occupational Health and Safety, is a key hospital located in Tatsumidai-Higashi, Ichihara City, Chiba Prefecture. It can be accessed by taking the Kominato Bus from JR Uchibo Line Yahatajuku Station for about 20 minutes, by taxi from Keisei Electric Railway Chihara Line Chiharadai Station for about 15 minutes, or by using the free shuttle bus. It is accessible within approximately 25 minutes from the Keiyo Road Soga IC and Tateyama Expressway Ichihara IC, and offers on-site parking. With 24 medical departments, it provides internal medicine services including gastroenterology, respiratory medicine, diabetology and endocrinology, hematology and oncology, allergy and rheumatology, palliative care, neurology, and cardiology. Surgical services include gastroenterological surgery, breast surgery, neurosurgery, plastic surgery, and thoracic surgery, with an emergency and critical care center also on-site. Specialized outpatient services include memory clinic (neurosurgery), smoking cessation clinic, and second opinion clinic. With 11 centers, it offers specialized medical care including dementia care center, cancer consultation support center, endoscopy center, joint surgery and joint replacement center, and sports medicine center. The Treatment and Work Balance Support Department provides support for balancing treatment and employment. Credit cards and electronic payments are accepted, interpretation is available in English, Korean, and other languages, and barrier-free facilities are provided. While respecting patient rights and providing safe, high-quality medical care, the hospital contributes to regional healthcare through acute and preventive medicine.