A stair lift for conveying a person from a first to a second level, comprising a rail which extends between said first and said second level, a frame which is provided with engaging means designed to engage the rail in such a manner that it can be moved along the rail and drive means designed to cause the frame to move along the rail, and a carrier mounted to the frame on which the person can seat himself, in particular a chair, which stair lift is further provided with means for locking and unlocking the stair lift, using control means intended for that purpose, such as a key, an on/off button, a detector for wireless detection of the presence of an electronic key that a person may carry near the stair lift, or a remote control unit for locking and unlocking the stair lift, whereby the stair lift further comprises: a safety device comprising a central processing unit and a wireless communication network designed to communicate status information on components of the stair lift and/or objects in the vicinity of the stair lift that are not mounted on or to the frame to the central processing unit, wherein the processing unit is designed for deciding, on the basis of the communicated status information, whether or not the frame is to be moved along the rail by the drive means, characterised in that the status information comprises information on one or more of the following aspects: - the position of a movable object (9, 10), for example a door, in the vicinity of the stair lift, which, in a particular position thereof, forms an obstacle to the functioning of the stair lift, to which end the object is provided with means for detecting the position of the object and with means connected to the communication network for communicating the status information to the central processing unit; - the position of a movable object, for example the head or another part of the body of a person on the stair lift, which is detected before the object hits the obstacle, to which end the obstacle is provided with means for detecting the approach of the object and with means connected to the communication network for communicating the status information to the central processing unit. a safety device comprising a central processing unit and a wireless communication network designed to communicate status information on components of the stair lift and/or objects in the vicinity of the stair lift that are not mounted on or to the frame to the central processing unit, wherein the processing unit is designed for deciding, on the basis of the communicated status information, whether or not the frame is to be moved along the rail by the drive means, characterised in that the status information comprises information on one or more of the following aspects: - the position of a movable object (9, 10), for example a door, in the vicinity of the stair lift, which, in a particular position thereof, forms an obstacle to the functioning of the stair lift, to which end the object is provided with means for detecting the position of the object and with means connected to the communication network for communicating the status information to the central processing unit; - the position of a movable object, for example the head or another part of the body of a person on the stair lift, which is detected before the object hits the obstacle, to which end the obstacle is provided with means for detecting the approach of the object and with means connected to the communication network for communicating the status information to the central processing unit. - the position of a movable object (9, 10), for example a door, in the vicinity of the stair lift, which, in a particular position thereof, forms an obstacle to the functioning of the stair lift, to which end the object is provided with means for detecting the position of the object and with means connected to the communication network for communicating the status information to the central processing unit; - the position of a movable object, for example the head or another part of the body of a person on the stair lift, which is detected before the object hits the obstacle, to which end the obstacle is provided with means for detecting the approach of the object and with means connected to the communication network for communicating the status information to the central processing unit.