An injection device (100), comprising: a security protection (104) having a first end and a surface disposed at a second end thereof to come into contact with the skin of a patient, having the safety protection a protection tab (164) extending there； a housing (108) slidably disposed with respect to the security protection, the housing including a guide groove (172) for attaching the protection flange (164) to guide the movement of the housing relative to the safety protection ( 104), the guide groove (172) having a first and second axial portion (184, 188) and a substantially helical portion (192) connecting the first and second axial portion； a medicine container (120) connected to the housing and having a needle (124) attached thereto in communication with a medicine disposed within the medicine container, where the medicine container can be moved with respect to the safety protection from an initial position to an injection position, to a withdrawn position； an inclination member (128) that tilts the medicament container out of the safety guard； and an injector member (112) slidably disposed with respect to the medication container, to eject the medication from the medication container； characterized in that: the housing comprises a flexible upper cantilever arm (176) and a lower flexible cantilever arm (180) which are locking members of the guide groove (172), by means of which the upper flexible cantilever arm (176) is disposed in the first axial portion of the guide groove and the lower cantilever flexible arm (180) is disposed in the second axial portion of the guide groove.Un dispositivo de inyección (100), que comprende: una protección de seguridad (104) que tiene un primer extremo y una superficie dispuesta en un segundo extremo de la misma para entrar en contacto con la piel de un paciente, teniendo la protección de seguridad una pestaña de protección (164) que se extiende desde allí； una carcasa (108) dispuesta de forma deslizable con respecto a la prot
