To suppress power consumption. An S20 irradiation device that irradiates infrared rays onto a target range, an S22 imaging device that picks up an infrared image reflected from the target range, and detects a gaze of a person within the target range based on the images. S26, if it is determined whether or not a person is included in the target range based on the image and S28, and if it is determined that no person is included in the target range, the irradiation device is irradiated with the infrared light A line-of-sight detection system, comprising: [Selection] Figure 5【課題】消費電力を抑制すること。【解決手段】対象範囲に赤外線を照射するＳ２０照射装置と、前記対象範囲から反射された前記赤外線の画像を撮像するＳ２２撮像装置と、前記画像に基づき前記対象範囲内の人の視線を検出するＳ２６検出部と、前記画像に基づき前記対象範囲内に人が含まれるか否かを判定しＳ２８、前記対象範囲内に人が含まれていないと判定した場合、前記照射装置に前記赤外線の照射を停止させる第１期間とするＳ１５制御部と、を備える視線検出システム。【選択図】図５
