To provide a support structure of a parcel shelf constituted so as to support a load of the parcel shelf by a vehicle body panel without using a conventional separate bracket.

When the parcel shelf 3 attached between a trunk room 1 and a cabin 2 of the automobile is supported, a pillar garnish 6 is attached to the vehicle body panel 5 so as to attach a rear pillar 5b in the vehicle body panel 5 of the automobile, the side wall lower side 5a of the automobile in the trunk room 1 and the cabin 2 is divided by a trunk room side trim 4, and a support base 9 for supporting the parcel shelf 3 is formed on the trunk room side trim 4. Further, a projection-like support part 4f is provided on the back surface side of the trunk room side trim 4 and an insertion hole 6f for inserting the projection-like support part 4f is formed at the pillar garnish 6. By inserting the projection-like support part 4f to the insertion hole 6f, the parcel shelf 3 is supported by the vehicle body panel 5 through the trunk room side trim 4 and the pillar garnish 6.