A lancet device is provided. The lancet device includes a lancing module and a lancing pen. The lancing module includes a lancing body and a cover. The lancing body includes a lancet and a first fastener. One terminal of the lancet is disposed in the lancing body. The first fastener is disposed on one terminal of the lancing body. The detachable cover engaged with one terminal of the lancing body includes a second fastener. By the engagement of the first fastener and the second fastener, the lancing body and the cover are engaged. The lancing pen includes a casing having an opening used to fill with the lancing module, and the casing includes a guiding plane. When the lancing module engaged on the lancing pen, the guiding plane near the opening of the lancing pen is guided to uninstall the fastening state between the lancet body and the cover.本創作提供一種採血裝置,其係包括一採血針組和一採血筆。採血針組包括一採血針本體和一保護蓋。採血針本體包括一刺針和一第一卡扣部,刺針的一端穿設於採血針本體中,第一卡扣部設於該採血針本體的一端。保護蓋係為可拆卸式地裝設於採血針本體的一端,包括一第二卡扣部。藉由第一卡扣部與第二卡扣部相互卡合,採血針本體與保護蓋係為一卡扣狀態。採血筆包括一殼體,殼體具有一開口端用以容置採血針組且包括一導引面,藉由採血針組安裝於該採血筆時,利用採血筆開口端的導引面導引而達到解除採血針本體與保護蓋的卡扣狀態。10‧‧‧採血裝置24‧‧‧採血針座261‧‧‧第一卡扣部28‧‧‧保護蓋281‧‧‧第二卡扣部282‧‧‧卡扣斜面283‧‧‧刺針容置部32‧‧‧殼體36‧‧‧殼體表面
