A cargo compartment structure for an automobile is disclosed. In one example, the cargo compartment comprises a trunk box disposed in a cargo compartment in a rear part of the automobile, the trunk box having an opening on its upper side; a cargo board capable of changing its position between a closed position where the opening is closed by the cargo board, and an open position where the opening is opened, the open position of the cargo board being frontward of the closed position; and a board holder for holding the cargo board in a specific state so that a top surface of the cargo board is downwardly inclined toward a rear side of the automobile and so that while the cargo board is in the open position, a rear end of the cargo board is disposed rearward of a front end of the trunk box.