of the trim board and an upper mold 72 formed with a molding surface 72a forming the back surface of the trim board are used this embodiment is different from the fourth embodiment only in the facts that the lower mold 71 is formed with resin supply passages 74 opening into the molding surface 71a at appropriately distributed positions and provided with a heater 75 to prevent fall of the temperature of resin 12melt supplied into the passages 74 and that the resin 12melt is injected by an injection device 73 into the passages 74 and supplied onto the front surface of the porous base member 11 through the passages 74 illustrated in fig8 is a sixth embodiment of the manufacturing method of the door trim board according to the present invention wherein a lower mold 81 formed with a molding surface 81a forming the front surface of the trim board and an upper mold 82 formed with a molding surface 82a forming the back surface of the trim board are used this embodiment is different from the fourth embodiment only in the facts that the upper mold 82 is formed with resin supply passages 84 opening into the molding surface 82a at appropriately distributed positions and provided with a.