OCCUPANT SENSING DEVICE

Provided is an occupant sensing device which accurately detects the state of an occupant regardless of the influence of extraneous noise, outside light, and the like and the influence of a defect in detected data when lighting of auxiliary light is delayed, and the like. When a specific part detection possibility/impossibility determination unit (24) determines that the detection of the position of a specific part such as a head (56) in the latest image is impossible, on the basis of past data stored as data corresponding to images outputted from a camera (14) earlier than the latest image in a storage unit (22), the position of the head (56) is predicted and detected.