The present invention relates to an invisible passenger airbag door, and more particularly, to an invisible passenger airbag door that is constructed by defining an incision portion through processing of micro holes on an instrument panel. In the invisible passenger airbag door, an incision portion is constructed at a portion of an instrument panel where a passenger airbag is installed, by processing micro holes at a corresponding portion of an inner surface of the instrument panel to conform to an outer contour of the passenger airbag. The micro holes constructing the incision portion are filled with a filling material that comprises fine particles with no viscosity.