The present invention relates to a safe and convenient blood-collection device further comprising a maintenance button absent in a conventional blood-collection device, as shown in the attached drawing, wherein a phlebotomy needle hole is further formed at a protection case to facilitate the replacement of a phlebotomy needle, and an installation means comprising a cut surface for fixing the phlebotomy needle is further formed at a phlebotomy portion. The present invention can precisely control the protection case through the maintenance button while visually discriminating the projected length of the phlebotomy needle when the phlebotomy needle is protruded from the protection case, and thus enables safe use by providing the projected length of the phlebotomy needle appropriate for a skin thickness, age and the like of a user. In addition, through the phlebotomy needle hole formed at the protection case, and the installation means, made of an elastic material, comprising a cut surface formed at the phlebotomy portion so as to correspond to the phlebotomy needle hole, it is possible to conveniently replace a phlebotomy needle with a new phlebotomy needle by merely pushing the new phlebotomy needle without separation from the protection case.La présente invention concerne un dispositif de collecte de sang sans danger et commode, comprenant en outre un bouton dentretien absent dans un dispositif de collecte de sang classique, comme indiqué dans le dessin annexé, un trou daiguille de phlébotomie étant en outre formé au niveau dun étui de protection pour faciliter le remplacement dune aiguille de phlébotomie, et un moyen dinstallation comprenant une surface coupée pour fixer laiguille de phlébotomie étant en outre formé au niveau dune partie de phlébotomie. La présente invention peut commander avec précision létui de protection par lintermédiaire du bouton dentretien, tout en distinguant visuellement la longueur projetée de laiguille de phlébotomie lorsque laiguille de
