Lancet device formed by a pressing member and piercing member is provided. In such a lancet device, the piercing member, made to have a needle shaft section having a puncture needle, a drive shaft portion, and an intermediate shaft portion therebetween, the intermediate shaft portion and the drive shaft portion and the needle shaft I would bet is coupled to each other by joints, respectively. Drive shaft of the piercing member is pivoted at least in part by the pressing of the pressing member, thereby moving the needle shank to the puncture direction of the intermediate shaft piercing member is displaced upon puncture.穿刺部材および押圧部材を有して成るランセット・デバイスが提供される。かかるランセット・デバイスでは、穿刺部材が、穿刺針を備えた針軸部と、駆動軸部と、それらの間の中間軸部とを有して成り、針軸部と駆動軸部と中間軸部とがそれぞれ関節部によって相互に連結されて成る。穿刺に際しては押圧部材の押圧によって穿刺部材の駆動軸部が少なくとも部分的に回動し、それによって、穿刺部材の中間軸部が変位して針軸部が穿刺方向へと移動する。
