A door panel that is capable of maintaining the adhering strength of the adhesive is provided. An outer panel and an inner panel are joined together by an adhesive. Adhesive retaining portions, each of which includes an adhesive retaining channel for retaining the adhesive, are provided in adhering portions of the inner panel. Each adhering portion includes vertically extending portions, and the adhesive retaining portions of the inner panel are formed in the shape of an extended raised portion and extend vertically in the respective vertically extending portions of the adhering portions, along ventilation openings, which are formed at locations corresponding to groups of ventilation holes of the outer panel. Each adhesive retaining portion is provided at the middle of each vertically extending portion of the adhering portions so as to be flanked by adhesion margins of identical width.
1. A door panel comprising:
an outer panel having a plurality of ventilation holes, and
an inner panel affixed to the inner surface of the outer panel, comprising:
a ventilation opening formed at a location corresponding to the plurality of ventilation holes of the outer panel;
an adhering portion bonded to the outer panel by an adhesive, and
an adhesive retaining portion formed in the adhering portion and having an adhesive retaining channel for retaining the adhesive,
wherein the adhesive retaining portion is formed in the shape of a continuously extended raised portion in the adhering portion and extends vertically along the ventilation opening.
2. The door panel as claimed in claim 1 , wherein: the adhering portion of the inner panel includes a vertically extending portion, and the adhesive retaining portion continuously extends in the vertically extending portion of the adhering portion.
3. The door panel as claimed in claim 2 , wherein: the adhesive retaining portion is provided at the middle of the vertically extending portion of the adhering portion.
4. The door panel as claimed in claim 1 , wherein: the adhesive retaining portion has a rising portion at which the adhesive retaining portion rises from the adhering portion, the rising portion having a cross section in the shape of a concave arc.
5. The door panels claimed in claim 1 , wherein: the adhesive retaining portion has a substantially arc-shaped cross section with such dimensions that the proportion of the height to the width thereof is in the range from ½ to ¼.