PURPOSE: To make it possible to easily lay a trim within a car trunk room by previously forming the each constituent piece of the trunk room trim into an integrated state.

CONSTITUTION: A trunk room trim 100 can be carried in a slab shaped state by folding a front part 102 and a rear part 103 against a floor part 101 and by further folding side parts 104, 104 via a hinge part 106. And, when the trim is assembled within a trunk room in an assembling line, the floor part 101 is firstly laid out on the floor surface of the trunk room keeping its folded state and then the side parts 104, 104, the front part 102 and the rear part 103 are raised, so that the assembly of the trunk trim 100 assembled in a body into a solid form can be easily obtained.