The present invention provides a kind of nib structure of blood collecting pen, be with a pen cover, in there is pass through aperture, be equipped with a reset spring in through hole, in the what reset spring and stand and have a blood taking needle. Wherein, the through hole of pen cover has a guide ramp； blood taking needle system carries in guide ramp merging reset spring； and blood taking needle top has a positioning region； to position what reset spring top； there is a pricker in the bottom end of blood taking needle, pricker is outer and coats a removable protective set, and removable protective set bottom end is round and smooth and projects through outside hole. Thereby, using the blood collecting pen for having nib structure of the present invention, not only the installing of blood taking needle and removal are all quickly easy, and almost its is micro- for its pain in collecting degree.本發明提供一種採血筆之筆頭結構，係具有一筆蓋，其內具有一貫穿孔，貫穿孔中設有一復位彈簧，於該復位彈簧中並靜置有一採血針。其中，筆蓋之貫穿孔具有一導引斜面，採血針係順沿導引斜面置入復位彈簧中，且採血針頂端具有一定位部，以定位於復位彈簧頂端，在採血針之底端具有一刺針，刺針外並包覆一可拆式保護套，該可拆式保護套底端圓滑並且伸出貫穿孔外。藉此，應用有本發明筆頭結構之採血筆，不僅採血針之裝設與卸除都快速容易，且其採血疼痛度近乎其微。
