PROBLEM TO BE SOLVED: To realize a puncture device and a drug solution administration device which are capable of being much easily downsized as compared with conventional ones.SOLUTION: A drug solution administration device 200 has a pull-back spring 271C for pulling back only an outer needle 203A into a casing 201, and the pull-back spring 271C is arranged inside a puncture spring 271B which is a taper spring so that the springs are configured in a double structure. In this way, a puncture mechanism 270 can be easily downsized as compared with puncture mechanisms in which the pull-back spring 271C and the puncture spring 271B are juxtaposed to each other, for example.COPYRIGHT: (C)2015,JPO&INPIT【課題】従来と比して一段と容易に小型化できる穿刺装置及び薬液投与装置を実現する。【解決手段】薬液投与装置200は、テーパーバネである穿刺バネ271Bの内側に、外針203Aのみを筐体201内に引き戻すための引き戻しバネ271Cを配置するようにして、バネを二重構造とした。こうすることにより、例えば、引き戻しバネ271Cと穿刺バネ271Bを並べて設けるような穿刺機構と比較して、穿刺機構270を容易に小型化することができる。【選択図】図13
