Abstract: Here is disclosed a needle detacher for syringe adapted to detach a needle after use for injection or blood-collecting from the associated syringe cylinder for easy and safe disposal, comprising a container main body, a lid assemble consisting of inner and outer lids, a needle chute opening formed through the outer lid, and a needle trap opening defined by the inner and outer lids so that a syringe cylinder or the outer lid may be forcibly rotated with the needle neck being held in the needle trap opening to detach the needle from the syringe cylinder and then the needle may be received through the needle chute opening into the container main body, wherein the needle chute opening is adapted to be closed by the inner lid which is slidable with respect to the outer lid so that the needle neck can be held by the inner lid cooperating with the outer lid.