PROBLEM TO BE SOLVED: To provide a liquid administration device which can administer only a liquid that is not contaminated by bacteria or the like to a living body.SOLUTION: A liquid administration device 1 for administering a liquid to a living body includes: a first port 31 to which a syringe 100 that is a supply source of the liquid is connected a second port 32 which has a sterilization filter 60 that prevents the passage of bacteria and allows the passage of the liquid in a flow passage, and where a tubular body 10 for administering the liquid to the living body is connected a third port 33 which has an air filter 40 that allows the passage of air in a flow passage and a switching part 80 which can take a first state in which the first port 31 communicates with the third port 33 by blocking the second port 32, a second state in which the first port 31 communicates with the second port 32 by blocking the third port 33, and a third state in which the second port 32 communicates with the third port 33 by blocking the first port 31.
