Method of manufacturing ultrafine bubble-containing liquid

A method of manufacturing an ultrafine bubble-containing liquid, comprising:

• a liquid film forming step of forming a liquid film on a collision member by wetting the collision member with a first liquid;
• a first supply step of supplying a second liquid having a dissolved gas amount different from that of the first liquid to a first liquid supply region in which a first discharge port forming member having a first discharge port with a minute diameter is arranged;
• and
• a first discharge step of pressurizing the second liquid supplied to the first liquid supply region and discharging the second liquid as one liquid droplet from the first discharge port, wherein
• the first liquid contains one or more first nuclei,
• the first nuclei are substances containing carbon atoms and have a diameter less than or equal to 100 nm, and
• the first discharge step is a step of discharging the one liquid droplet so as to collide with the liquid film formed in the liquid film forming step, with a flight velocity of the one liquid droplet upon colliding with the liquid film being greater than or equal to 1 m/s.