A bonding apparatus has a light source, a stage, a component holder formed of a light transparent material, a controller, and a driver configured to drive the stage and the component holder under the control of the controller. The component holder includes an incident surface on which light outputted from the light source is made incident, a first reflection surface which is a surface opposite to the incident surface and reflects the incident light from the incident surface, a second reflection surface which reflects the light reflected by the first reflection surface, and an exit surface from which the light reflected by the second reflection surface exits. The bonding apparatus bonds the first component and the second component together with the photo-curing adhesive while holding the second component on the side of the exit surface of the component holder.