A flux transfer unit is provided to be used in an electronic component mounting apparatus which transfers a flux onto an electronic component taken out from a component supplying section and mounts the electronic component on a substrate. A blade holding head is provided with a first blade and a second blade which are reciprocally driven by a rodless cylinder through a drive transmitting pin and are used for flux film formation/scraping. In the flux transfer unit, the blade holding head is swingably held by a moving member around a swing support pin, and the moving member is braked by a prescribed braking force by a plate spring member. Thus, each time the blade moving direction is inverted, the blade supporting head swings, and the first blade and the second blade can be automatically switched without arranging an exclusive drive mechanism.