Liquid dosage device is of a cylindrical shape, and the cylindrical body the liquid is filled on the inside thereof, the distal end of the tubular body, through the tubular body and communicating, or provided so as to be communicated with, sharpened distal end a needle tube having a needle tip, the cover and gasket can slide in the tubular body, an operating member for performing a pressing operation for discharging the liquid from the needle tube to press against the gasket in the distal direction, at least the needle point of the needle tube 1 of the position, to move in the proximal direction from the first position, the third position of the cover and a second position in which the needle tip is exposed, at least the needle tip again to move in the distal direction from the second position preparative a cover member movable into, and the cover member to allow the movement from the first position to the second position, again from the cover member is moved to the third position from the second position and a regulation member that can be taken and the state to regulate the movement to the second position.液体投与具は、筒状をなし、その内側に液体が充填された筒体と、筒体の先端側に、筒体と連通して、もしくは連通可能に設けられた、先端に鋭利な針先を有する針管と、筒体内で摺動し得るガスケットと、ガスケットを先端方向に向かって押圧して液体を針管から吐出させる押圧操作を行なう操作部材と、針管の少なくとも針先を覆う第1の位置と、第1の位置から基端方向に移動して、針先が露出する第2の位置と、第2の位置から先端方向に移動して再度少なくとも針先を覆う第3の位置とに移動可能なカバー部材と、カバー部材が第1の位置から第2の位置への移動するのを許可する状態と、カバー部材が第2の位置から第3の位置に移動してから再度第2の位置へ移動するのを規制する状態とを取り得る規制部材とを備える。
