A device capable of smoothly, easily and automatically installing a molding on a door panel for an automobile is provided and includes a molding installation jig and a dynamic sensor located between a jig body and an arm. The dynamic sensor is designed to detect a force applied from the molding installation jig to the molding. A finger is supported on a side of the jig body to contact and hold an end section of the molding. Three suction pads, which communicate with a vacuum device, are provided on a surface of the jig body at equal intervals. A pair of brackets having a C-shaped cross section are provided on a side surface of the jig body, which is perpendicular to the surface on which the suction pads are provided. A first roller, a second roller, and a third roller 19 are rotatably supported in each of the brackets.