PURPOSE: To provide a trunk room for a motor vehicle, which is suitable for the transport of delicate items such as clothing, males the putting in/out of storage items easy, and does not inhibit the volume of a trunk room from being used to the maximum.

CONSTITUTION: This trunk room comprises a trunk lid 9 equipped with a storage bag support member 1, a storage bag 6 that can be detached, and an immobilization device for immobilizing the storage bag 6. Storage items are accommodated in a storage place consisting of the storage bag support member 1 and the storage bag 6 to be protected. The storage bag is immobilized by an immobilization mechanism during the transport, and is slid in sliding grooves, when it is put in and out, to be put in and out easily. The side surfaces of the storage bag 6 are made of a flexible material to be bent, so that it is not inhibited to use the capacity of the trunk room to the maximum. The storage bag support member 1 can be located at the position suitable for being put in and out, interlockingly with the movement of the trunk lid 9.