In the component mounting device, a control device includes a model data storage section for storing model data related to a component, an error determining section for determining whether a processing error has occurred, and a confirmation-necessity storage section for storing whether confirmation of the validity of the model data is necessary when the processing error has occurred in a series of processes performed based on each piece of model data stored in the model data storage section. When it is determined that a processing error has occurred, the control device temporarily suspends the operation of the component transfer device when the model data, related to the target component held by the component transfer device, stored in the confirmation-necessity storage section indicates that confirmation is necessary, but continues the operation of the component transfer device when the model data stored in the confirmation-necessity storage section indicates that confirmation is unnecessary.