There is provided an applicator including: a first liquid flow path through which a first liquid containing fibrinogen passes; a second liquid flow path through which a second liquid containing thrombin passes; a confluence section in which the first liquid and the second liquid merge with each other to form a mixed liquid; and a gas flow path through which a gas for jetting the mixed liquid passes. At least part of a wall portion defining the confluence section is composed of a gas-permeable membrane that is impermeable to the mixed liquid and permeable to the gas. The length of the gas-permeable membrane in a direction in which the mixed liquid flows through the confluence section is 5.0 to 39.0 mm. The flow rate of the gas permeating through the gas-permeable membrane is 0.3 to 2.4 L/minute.