PROBLEM TO BE SOLVED: To provide a device for improving the reliability of the acquisition of biological information by a biological sensor at the collision of a vehicle.SOLUTION: A crew member state acquisition device comprises: a biological sensor 11 disposed on at a seat 4 equipped by a vehicle for acquiring biological information of a passenger 5 seated on the seat 4 by irradiating a wave toward the passenger 5; estimation means for estimating a collision mode at the collision time of the vehicle; and setting means for setting an irradiation angle of the wave in accordance with the collision state estimated by the estimation means.SELECTED DRAWING: Figure 1