PROBLEM TO BE SOLVED: To provide a body movement detection sensor capable of reliably detecting the body movement due to the respiration of a patient, which has high durability, does not obstruct photographing, and requires no skill.SOLUTION: The body movement detection sensor unit (11) is configured to include a first case (21) serving as a pressure part, a thin film sensor (23), and a second case (22) containing the thin film sensor (23). The first and second cases (21, 22) are communicated with each other by a coupling tube (25), and silicon oil (27) is sealed therein. The body movement detection sensor unit (11) is provided to a bed (3), and the pressure part (21) is inserted between the back side of the patient and a table (8) so as to detect the body movement.
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