CABIN-INSIDE DETECTION DEVICE AND CABIN-INSIDE DETECTION METHOD

A first data acquiring unit to acquire first data acquired by a first sensor, a second data acquiring unit to acquire second data acquired by a second sensor installed above a seat in a cabin, a front-seat occupant position estimating unit to estimate a position of an occupant on a basis of the first data acquired by the first data acquiring unit, a detection range determining unit to determine a detection range of the second sensor on a basis of the position of the front-seat occupant estimated by the front-seat occupant position estimating unit, and a rear-seat occupant detecting unit to detect a rear-seat occupant on a basis of the second data acquired by the second data acquiring unit and the detection range of the second sensor determined by the detection range determining unit are provided.