Push nuts for cars, comprising a head having a member contact surface formed protruding in left and right sides, and having a fastening hole formed penetrating at the center; and a body having formed penetrating at the center, a fastening hole having the same inner diameter and center as the fastening hole which is formed at the head, characterized in that the body and the head are connected to a connecting bridge that elastic deformation is performed outwards, and the head and the body connected with the connecting bridge respectively have a head axial force support and a body axial force support formed protruding toward a space, the head axial force support and the body axial force support having fastening holes having the same center as the fastening holes respectively formed penetrating.