| 摘要 |
An injection needle retractable injector, comprising: a barrel having a plunger inserted into a bore formed therein; a needle base attached to the tip part of the barrel; a hub attached to a bore of the needle base so as to be capable of being separated only toward the rear end; and an injection needle with a rear end part fixed to the tip part of the hub, the plunger being capable of being moved to the tip part of the barrel to engage the rear end part of the hub with the tip part of the plunger, so that the injection needle can be pulled into the barrel through the plunger; wherein the hub is held in the needle base by a fitting structure formed between the outer peripheral surface of the tip part of the hub and the inner surface of the tip part of the needle base, and in the fitted state in which the hub is positioned at the closest to the tip side of the needle base, the tip of the hub is positioned near or forward of the tip of the needle base in the axial direction. <IMAGE>
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