A door sash joined to a door body in a simple manner is provided. A door sash includes a design part, a tubular part, and a connection part. The connection part includes a first connection part continuous to the design part, a second connection part continuous to the tubular part, and a stepped part between the first connection part and the second connection part. The second connection part is closer to the inner side of the door opening than the first connection part. A vicinity of one end of the plate material in a cross section view includes an overlapping part forming a closed cross section by overlapping on the second connection part from the outside. The surface of the overlapping part is closer to the inner side of the door opening than the surface of the first connection part or flush with the surface of the first connection part.