In a state in which an insert (310) is embedded in an embedding opening of a panel (300) and a nozzle (211) of a dispenser (210) is located above an injection hole of the insert, an air cylinder (230) presses an edge of a discharge port (212) of the nozzle on an edge of the injection hole of the insert. Subsequently, the dispenser discharges an adhesive from the discharge port of the nozzle. The adhesive is injected from the injection hole of the insert, and fills a gap between the insert and the panel. Therefore, the insert is fixed to the panel.