In a window module including a molding molded along the peripheral part of a window panel in situ, the deformation of the molding due to the shrinkage following the molding process is controlled. The window module comprises a window panel and a molding molded on and attached to a peripheral part of the window panel. The molding comprises a base portion extending along and attached to the peripheral part and a projection projecting from and extending along the peripheral part, and the projection is provided with an easily deformable portion at least in a part of the projection located along a lengthwise direction of the peripheral part, the easily deformable portion being deformable in the lengthwise direction of the peripheral part more readily than a remaining part of the projection.