Patent attributes
Display with high visibility without impairing rigidity of a housing is performed. A light curtain includes: a housing in which one element of a pair of elements disposed inside along a longitudinal direction in order to form the plurality of optical axes at intervals, the housing including a metal case and end members connected to both ends of the metal case; a cover that transmits light from a light projecting element, which is the one element, and is attached to the housing so as to cross the optical axe; an indicator lamp that is a light diffusing member disposed outside an outer surface of at least one of the cover and the housing along the longitudinal direction or formed in series with the cover; and an indicator lamp light source that is accommodated in the housing and supplies light for displaying toward the indicator lamp.
