Provided is a safety scanner capable of easily grasping the correspondence relationship between a distance measurement position on a scanning plane and a real space. The safety scanner includes a distance measurement section that obtains distance measurement information corresponding to a distance optically sensed and a scanning angle of a detection light, an intrusion sensing section that senses an intruder within the protection area on the basis of the distance measurement information and a area designation information, a marker identification section that identifies a marker movably disposed within the detection area, and the distance measurement information of the marker as an area generation information for determining the protection area.