PROBLEM TO BE SOLVED: To improve detection accuracy by discriminating the action that a patient or a care-receiver touches a handrail from the action of hanging a nursing item or an accessory apparatus, and detecting it.SOLUTION: Infrared light emitting devices 41-44 and light receiving devices 51-54 are attached to both ends of the handrails 31-34 provided on the side part of a bed 20, beam-like detection light whose diameter is set corresponding to the thickness dimension of the finger of a patient is sent out from the infrared light emitting devices 41-44 in parallel to the grip surface in the longitudinal direction of the handrails 31-34, and the detection light which has passed on the grip surface is received by the light receiving devices 51-54. Then, light reception signals outputted from the light receiving devices 51-54 are fetched to a control part 70, the signal level Dn of the light reception signals fetched this time is compared with the half value (1/2) of the signal level Dn-1 of the light reception signals fetched in the previous time, and when Dn
