This liquid administration tool is provided with: a cylindrical body which forms the shape of a cylinder and the inside of which is filled with a liquid a needle tube having a sharp needle tip at the distal end, the needle tube being provided either communicating with or so as to be able to communicate with the cylindrical body at the distal end side of the cylindrical body a gasket that can be slid within the cylindrical body an operation member for carrying out a pushing operation for pushing the gasket in the distal end direction and expelling the liquid from the needle tube a cover member able to move to a first position for covering at least the needle tip of the needle tube, a second position in which the cover has moved in the proximal end direction from the first position, exposing the needle tip, and a third position in which the cover has moved in the distal end direction from the second position, again covering at least the needle tip and a regulating member enabling the enacting of a state for allowing the cover member to move from the first position to the second position and a state for regulating movement by the cover member back to the second position after having moved from the second position to the third position.Linvention concerne un outil dadministration de liquide, qui comprend : un corps cylindrique qui constitue la forme dun cylindre et dont lintérieur est rempli dun liquide un tube daiguille ayant une pointe daiguille pointue à lextrémité distale, le tube daiguille étant conçu soit pour communiquer soit pour être apte à communiquer avec le corps cylindrique au niveau du côté extrémité distale du corps cylindrique un joint détanchéité qui peut être amené à coulisser à lintérieur du corps cylindrique un élément dactionnement pour réaliser une opération de poussée pour pousser le joint détanchéité dans la direction dextrémité distale et expulser le liquide du tube daiguille un élément de couvercle apte à se déplacer vers une première posit
