To connect and disconnect a lighting unit easily, and to store the lighting unit compact, by developing the first and the second subunits in the plane direction to a main unit so as to direct lighting lamps, and bending the subunits in the orthogonal direction to the main unit so as to store by opposing the lighting lamps, while earthing the other ends of both subunits.

At one side 5Aa of a main unit 5A in which plural lighting lamps 8 are provided to a unit frame 20, one end 5Ba of the first subunit 5B in which plural lighting lamps 8 are provided to a unit frame 30 is connected. In the same manner, one end 5Ca of the second subunit 5C is connected to the other side 5Ab of the main subunit 5A. And the first and the second subunits 5B and 5C are developed in the plane direction to give the developing postures, while they are bent in the orthogonal direction to the main unit 5A respectively, so as to give the storing postures. In the developing posture, the lighting lamps 8 are directed in the same direction. And in the storing posture, the lighting lamps 8 are opposed each other, and the other ends 5Bb and 5Cb of the first and the second subunits 5B and 5C are earthed so as to give the self sustaining.