Vehicle ceiling assembling structure and a vehicle ceiling assembling method

In a structure for assembling lamps 30 to 32 and a wire harness for those lamps onto a body ceiling 2 of a vehicle body 1, the lamps 30 to 32 and the wire harness for the lamps are assembled to a sub-frame 25 in advance, and electrically connected to each other in advance. In the assembling work, the sub-frame 25 is assembled to the body ceiling 2 of the vehicle body 1, whereby the lamps 30 to 32 and the wire harness for the lamps are assembled to the body ceiling 2 by one assembling work.