There is provided an applicator for ejecting together with a gas a mixed liquid obtained by mixing a first liquid and a second liquid which are different from each other in composition. The applicator includes a first liquid flow path through which the first liquid flows； a second liquid flow path through which the second liquid flows； a gas flow path through which the gas flows； a confluence section in which the first liquid and the second liquid merge with each other to form the mixed liquid, at least part of a wall portion defining the confluence section being composed of a gas-permeable membrane which is impermeable to the mixed liquid and permeable to the gas； and a backflow preventing section that prevents backflow of the first liquid and prevents backflow of the second liquid.
