Abstract: Provided are a sleeping state detection system and method that can detect the sleeping state of a subject such as an inpatient or a tenant without causing the subject stress, and that can ascertain the health state of the subject from the detection results. The sleeping state detection system includes a room or closed space (201) in which the subject sleeps, and a dust counter (206) that measures the dust particles inside the room or closed space (201). In a state where the inside of the room or closed space (201) is kept cleaner than the outside of the room or closed space (201) by using a fan filter unit (208) disposed in the room or closed space (201), while the subject sleeps, the change over time in the number of dust particles inside the room or closed space (201) is measured using the dust counter (206), and thereby the sleeping state of the subject is detected. The inside of the room or closed space (201) is preferably kept at a cleanliness of US 209D Class100 or better.

Abstract: Provided are a sleeping state detection system and method that can detect the sleeping state of a subject such as an inpatient or a tenant without causing the subject stress, and that can ascertain the health state of the subject from the detection results. The sleeping state detection system includes a room or closed space (201) in which the subject sleeps, and a dust counter (206) that measures the dust particles inside the room or closed space (201). In a state where the inside of the room or closed space (201) is kept cleaner than the outside of the room or closed space (201) by using a fan filter unit (208) disposed in the room or closed space (201), while the subject sleeps, the change over time in the number of dust particles inside the room or closed space (201) is measured using the dust counter (206), and thereby the sleeping state of the subject is detected. The inside of the room or closed space (201) is preferably kept at a cleanliness of US 209D Class100 or better.

Abstract: An indicator needle is provided with a base having a groove having a U-shaped cross section, which groove has an opening in an upper surface thereof and extends in a longitudinal direction of the indicator, and a light transmitting lens which plugs the opening of the upper surface of the base. A plurality of light emitting diodes are arranged in the groove of the base. Base ribs each having a triangular cross section and formed integrally with the base so as to cross the groove of the base are provided in the groove of the base, as well. Light generated from the light emitting diodes directly illuminates the lens, or is reflected by the base ribs to illuminates the same.