PURPOSE: To prevent a synthetic resin plate from generating distortion by heat generated by a light source of a ceiling lighting device.

CONSTITUTION: Synthetic resin plates 11, 12 are connected to a frame 13 through elastic units 14a, 14b. A lighting plate, for instance, constitutes the synthetic resin plate 11 of an acrylic mirror of applying a predetermined pattern by etching work, synthetic resin plate 12 in a lower side of an acrylic half mirror, frame 13 of an aluminum bar material and the elastic units 14a, 14b of a structural adhesive tape. Accordingly, extension/contraction by heat of the synthetic resin plates 11, 12 is absorbed by the elastic units 14a, 14b, and by maintaining rigidity of a total unit by the frame 13, the lighting plate made look attractive in design can be provided.