Abstract: A liquid-spraying adapter is provided which connects to a nozzle, which is of a compressed gas supply means of an air gun and the like, and uses the compressed gas thereof to allow a liquid to be sprayed. A liquid-spraying adapter (2) was constituted, which is a liquid-spraying adapter that may connect to a nozzle (101), which is of a compressed gas supply means (100), provided with a connecting port (4) that may be removably connected to the nozzle (101), a liquid-spraying nozzle port (5) that sprays a liquid, a liquid reservoir coupling port (6) that may be removably coupled to a liquid reservoir (3) that houses a liquid, a communicating passage (7) that communicates between the connecting port (4) and the liquid-spraying nozzle port (5), and a liquid supply passage (8) that communicates between the communicating passage (7) and the liquid reservoir coupling port (6) and may aspirate the liquid inside the liquid reservoir (3) when a compressed gas flows through the communicating passage.