To considerably improve the degree of freedom of construction or setting of a partition wall and the degree of freedom of setting of an illumination device in a residence.SOLUTION: In a ceiling illumination system 1, on a rear surface side of a ceiling board 51, a plurality of power supply units 3 incorporating primary coil 11 are arranged, a metal plate 4 presenting a rectangular shape bored with a belt-like notch groove part 4a on the surface side of the ceiling board 51 is pasted and arranged in the way that a position of the belt-like notch groove part 4a corresponds to positions of the power supply units 3. On the other hand, on the surface side of the ceiling board 51, a ceiling 8 where a power-receiving unit 6 incorporating a secondary coil 13 and a permanent magnet 7 are disposed inside, and a lighting apparatus 9 freely fitted to the ceiling 8 are freely installed by causing the metal plate 4 to adsorb the permanent magnet 7.SELECTED DRAWING: Figure 2
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