One kind unloading needle device, comprising: a moving member, an ontology and an elastic element. Moving member has a through-hole. Ontology then includes: one first accommodating space, one first aperture and one second aperture. The first accommodating space of what is arranged in moving member and part is pierced by the second aperture of what, and moving member can move between the first position and the second position in the first accommodating space of what. Elastic element offsets with moving member, and moving member is made to have the potentiality mobile towards first position. When moving member position what first position, non-the first aperture of face of through-hole, when moving member is moved to the second position, first aperture of through-hole face.一種卸針裝置,包括:一移動件、一本體及一彈性元件。移動件具有一通孔。本體則包括:一第一收容空間、一第一開孔及一第二開孔。移動件設置於第一收容空間且部分穿出於第二開孔,移動件可於第一收容空間中的第一位置與第二位置之間移動。彈性元件與移動件相抵持,使移動件具有朝第一位置移動的潛勢。當移動件位於第一位置時,通孔未正對第一開孔,當移動件移動至第二位置時,通孔正對該第一開孔。10‧‧‧第一殼體101‧‧‧第一凹槽102‧‧‧第一開口103‧‧‧第二凹槽104‧‧‧第一開孔11‧‧‧第二殼體111‧‧‧第三凹槽112‧‧‧第二開口113‧‧‧第四凹槽114‧‧‧凹孔12‧‧‧彈性元件13‧‧‧移動件131‧‧‧擋止部132‧‧‧按壓部133‧‧‧卡合部134‧‧‧通孔2‧‧‧注射器21‧‧‧針頭外蓋22‧‧‧針筒O‧‧‧第二開孔S1‧‧‧第一收容空間S2‧‧‧第二收容空間
