An interior cover mount assembly comprising: a base member; and an interior cover that is attached to the base member from a vehicular interior side in a mounting direction, the interior cover including a clip with which the interior cover is fixed to the base member, the clip including an arm section extending from the interior cover toward the base member, and a head section that is included continuously from a distal end portion of the arm section and has a width greater than that of the arm section, the base member having an insertion stopper hole through which the head section is inserted, the insertion stopper hole including an insertion section through which the head section is inserted and a holding section extending from the insertion section and having a width smaller than that of the head section and greater than that of the arm section and in which the arm section is arranged, characterized in that the base member has a projection projecting from a vehicular interior side surface of the base member toward the interior cover, the projection being disposed near the holding section, wherein in the interior cover that is mounted on the base member, the clip is fit in the insertion stopper hole such that the head section overlaps the holding section and the projection in the mounting direction, the clip is elastically deformed toward the insertion section by contact with the projection according to movement of the interior cover toward the base member in the mounting direction in a mounting operation of the interior cover to the base member, and according to further movement of the interior cover toward the base member in the mounting direction, the head section is inserted through the insertion section and the clip elastically restores its original shape and the arm section is fit in the holding section such that the clip is held in the insertion stopper hole. a base member; and an interior cover that is attached to the base member from a vehicular interior side in a mounting direction, the interior cover including a clip with which the interior cover is fixed to the base member, the clip including an arm section extending from the interior cover toward the base member, and a head section that is included continuously from a distal end portion of the arm section and has a width greater than that of the arm section, an arm section extending from the interior cover toward the base member, and a head section that is included continuously from a distal end portion of the arm section and has a width greater than that of the arm section, the base member having an insertion stopper hole through which the head section is inserted, the insertion stopper hole including an insertion section through which the head section is inserted and a holding section extending from the insertion section and having a width smaller than that of the head section and greater than that of the arm section and in which the arm section is arranged, characterized in that the base member has a projection projecting from a vehicular interior side surface of the base member toward the interior cover, the projection being disposed near the holding section, wherein in the interior cover that is mounted on the base member, the clip is fit in the insertion stopper hole such that the head section overlaps the holding section and the projection in the mounting direction, the clip is elastically deformed toward the insertion section by contact with the projection according to movement of the interior cover toward the base member in the mounting direction in a mounting operation of the interior cover to the base member, and according to further movement of the interior cover toward the base member in the mounting direction, the head section is inserted through the insertion section and the clip elastically restores its original shape and the arm section is fit in the holding section such that the clip is held in the insertion stopper hole.