An actuator main body (41) is fixedly mounted on an aerosol container (11) in a manner to enclose stems (15, 15) of the aerosol container. A nozzle main body (42) which is formed with a plurality of independent communication flow paths (42a) each of which communicates with one of the stems and has an injection opening (42b) at one end and a fitting connection portion which is fitted and connected to the stem is provided in the actuator main body. A scraping and washing member (43) is mounted on the communication flow paths in a manner to be pushed in and pulled out of the communication flow paths through the injection openings of the nozzle main body (42), said scraping and washing member (43) having a flow path portion (43d) formed with flow paths for contents liquids and a scraping portion (43e) for scraping out substance remaining after injection of the contents liquids. The scraping and washing member (43) is held by holding means at a scraping and washing position where the scraping and washing member is pulled out of the communication flow paths. By taking out the scraping and washing member (43) from the nozzle main body (42) and holding the scraping and washing member (43) at the scraping and washing position, remaining substance in the communication flow path can be scraped out. By causing water to flow through a washing water flow path in the communication flow path where the remaining substance has been scraped out, the communication flow path can be washed. On the other hand, even in the state in which the scraping and washing member (43) is inserted, a flow path can be secured by the flow path portion of the scraping and washing member (43) whereby injection of contents liquid can be secured.