A retaining element for a side window of a vehicle, includes at least one contact section for securing to a first surface of the side window, wherein the contact section has a contact surface that is provided for being connected to the first surface via an adhesive, a securing section connected to the contact section and for securing to the vehicle, and a filling opening for injecting the adhesive into the intermediate space between the contact section and the first surface of the side window, wherein the contact surface has a plurality of channels that are directed toward the filling opening and are distributed over the contact surface in a fan-like manner.