To provide a package tray structure with high sound insulation and absorption properties against entrance of sound wave, and also with practical utility.

This package tray sound absorption structure is constructed such that: the package tray embedded with a sound absorption member provided flush with the surface of a naturally hard substrate is arranged between a cargo room and an inclined window surface of a passenger car; and a sound wave generated by the running of the car in the road surface direction and entering into the cargo room, is introduced into a space between the package tray and the inclined window surface from a defined route, reflected between them a plurality of times, and transmitted in the rear seat direction, while it is attenuated gradually by the incidence into the sound absorption member embedded in the package tray.