PROBLEM TO BE SOLVED: To provide an on-board device which enables an occupant to take an appropriate response easily when diagnosing that the health status of the occupant is abnormal.SOLUTION: The on-board device for diagnosing the health status of the occupant of a vehicle is provided with: an information acquiring unit for acquiring the biological information of the occupant in the vehicle a disease name candidate memory for storing disease name candidate information in which conditions for diagnosing that the biological information acquired by the information acquiring unit is abnormal are associated with disease name candidates and a candidate retrieval unit for retrieving the disease name candidates associated with the conditions, which the biological information acquired by the information acquiring unit meets, from the disease name candidate information to display on a display device as a list.COPYRIGHT: (C)2012,JPO&INPIT【課題】乗員の健康状態を異常と診断した場合に、乗員へ容易に適切な対応を取らせることができる車載装置を提供すること。【解決手段】車両の乗員の健康状態を診断する車載装置へ、車両内で乗員の生体情報を取得する情報取得部と、情報取得部によって取得された生体情報を異常と診断する条件と病名の候補とが対応付けられた病名候補情報を記憶する病名候補記憶部と、情報取得部によって取得された生体情報が満たす前記条件へ対応付けられている病名の候補を病名候補情報から検索して表示装置へ一覧表示させる候補検索部とを設ける。【選択図】図1