PROBLEM TO BE SOLVED: To provide an indoor daylighting device capable of guiding sunlight to the interior of the room and improving workability. SOLUTION: An indoor daylighting device (1) is installed on a window side, and is installed on a ceiling (34) and a reflection part (10) that reflects sunlight and directs the reflected light to a ceiling (34) in the room (35). The light guide plate (20) is installed and receives reflected light from the reflection part (10) and emits the light to a predetermined position in the room (35). The light guide plate (20) is provided with the reflection part (10). A light introducing part (21) for receiving reflected light from the light emitting part, a light emitting part (23) for emitting light incident on the light introducing part (21) at a predetermined position in the room (35), and a light introducing part (21). And a light guide part (22) for connecting the light output part (23) and guiding the light from the light introducing part (21) to the light output part (23) and for preventing the light from entering the room (35). including. [Selection diagram] Figure 1
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