Provided is a liquid dosing instrument whereby rotation of a needle tube can be suppressed and a burden on an organism can be reduced. A liquid dosing instrument (10) having: a syringe (60) capable of accommodating a liquid in an inside thereof a needle tube (66) capable of passing through the inside of the syringe (60) an inside structure (40) for retaining the syringe (60) a cover member (30) urged toward a distal end in relation to the inside structure (40) and surrounding an external periphery of the needle tube (66), an opening (38) being formed on a distal-end side thereof, and the cover member (30) moving toward a proximal end in relation to the inside structure (40) and thereby causing the needle tube (66) to protrude toward the distal end from the opening (38) and a grip part (20) formed so as to cover at least a portion of the syringe (60), the inside structure (40), and the cover member (30), the grip part (20) for moving toward the distal end in relation to the inside structure (40) and thereby causing the liquid inside the syringe (60) to be discharged from the needle tube (66) the inside structure (40) being capable of rotating in relation to the grip part (20) and being provided with a support part (118) for supporting the syringe (60) so as to be able to rotate relative thereto.Linvention concerne un instrument de dosage de liquide, grâce auquel une rotation dun tube daiguille peut être éliminée et une charge sur un organisme peut être réduite. Linstrument de dosage de liquide (10), selon linvention, possède : une seringue (60) pouvant recevoir un liquide en son intérieur un tube daiguille (66) pouvant passer à travers lintérieur de la seringue (60) une structure intérieure (40) pour retenir la seringue (60) un élément de couvercle (30) poussé vers une extrémité distale par rapport à la structure intérieure (40) et entourant une périphérie externe du tube daiguille (66), une ouverture (38) étant formée sur son côté dextrémité distale et lélément de c
