A liquid administration tool (10) is provided with the following: an inner structure (1) that is provided with a cylindrical body (2) and a double-headed needle (71) an operation member that performs a pressing operation to discharge a liquid from the double-headed needle (71) by moving towards the end direction a cover member (6) that can move between a position (A) in which the cover member (6) covers the end-side needle tip of the double-headed needle (71) and a position (B) in which the cover member (6) retracts in the base direction from the position (A), and the end-side needle tip is exposed and a cap (9) that is mounted in an unused state where the pressing operation is not yet implemented, is withdrawn during the pressing operation, and is mounted again in a used state after the pressing operation is complete. The cap (9) comprises the following: a plurality of engagement pieces (93) that regulate the movement of the operation member (5) in the direction of the tip in an unused state and a tip wall section (911) that covers, from the tip side, an opening section (621) of the cover member (6) which is in the position (A), both in the unused state and in the used state.La présente invention concerne un outil dadministration de liquide (10) pourvu des éléments suivants : une structure interne (1) pourvue dun corps cylindrique (2) et dune aiguille à deux têtes (71) un élément dactionnement qui réalise une opération de compression pour évacuer un liquide provenant de laiguille à deux têtes (71) en se déplaçant vers le direction dextrémité un élément de couvercle (6) pouvant se déplacer entre une position (A), dans laquelle lélément de couvercle (6) recouvre le côté dextrémité la pointe de laiguille à deux têtes (71), et une position (B), dans laquelle lélément de couvercle (6) se rétracte dans la direction de base depuis la position (A) et le côté dextrémité de la pointe daiguille est exposé et un capuchon (9) monté dans un état non utilisé dans lequel lopéra
