This liquid-administering instrument (10) is provided with: an internal structure (1) provided with an inner cylinder (3) capable having an interior thereof filled with a liquid, a double-ended needle (71), and an outer cylinder (4) an operation member (5) for performing a pressing operation which causes the liquid to be discharged from the double-ended needle (71) a cover member (6) capable of moving between a position (A) in which a needle tip of the double-ended needle (71) is covered, and a position (B) in which the needle tip is exposed a coil spring (13) which impels the cover member (6) in an end direction a lock part (50) which, when the cover member (6) moves from position (B) to position (A), and the movement amount of the cover member (6) reaches a lockable movement amount, restricts movement of the cover member (6) towards position (B) and a movement-amount restriction part (80) which restricts the movement amount of the cover member (6) such that the movement amount of the cover member (6) does not reach the lockable movement amount until the cover member (6) is positioned in position (B) and the pressing operation is complete.Linvention concerne un instrument dadministration de liquide (10) comprenant : une structure interne (1) pourvue dun cylindre interne (3) dont lintérieur peut être rempli dun liquide, dune aiguille à deux pointes (71) et dun cylindre externe (4) un élément fonctionnel (5) destiné à effectuer une opération de pressage qui entraîne lévacuation du liquide par laiguille à deux pointes (71) un élément de recouvrement (6) pouvant se déplacer entre une position (A) dans laquelle une pointe de laiguille à deux pointes (71) est recouverte et une position (B) dans laquelle la pointe de laiguille est découverte un ressort hélicoïdal (13) qui sollicite lélément de recouvrement (6) en direction dune extrémité une partie verrou (50) qui, lorsque lélément de recouvrement (6) se déplace de la position (B) à la position (A) et que la quantité
