Device (100) for injection of fluid product, having a syringe body (101) and a needle (110) fixed in an axial end projection (102) of the syringe body, said injection device having a needle protection device (200), said protection device being fixed on said injection device in a storage position, said protection device being removable from said injection device, said protection device having an internal body (210) made of substantially flexible or deformable material, and an external body (220) made of substantially rigid material, said internal body (210), in the storage position, closing the dispensing orifice (111) of said needle (110) in a leaktight manner and cooperating with said injection device (100) in a leaktight manner, and said external body (220), in the storage position, cooperating with said injection device (100) in order to fix said protection device (200) on said injection device (100), said needle protection device having a protection system (300) against accidental pricking, said protection system (300) having protection flaps (320) that form an integral part of said external body (220), said protection flaps (320) being movable between a covering position, in which they cover the needle (110), and an open position, in which the needle is uncovered, said protection system (300) additionally having a control ring (310) sliding on said external body (220) in order to move said protection flaps (320) from their covering position to their open position before injection, and then from their open position to their covering position after injection.Dispositif dinjection de produit fluide (100) comportant un corps de seringue (101) et une aiguille (110) fixée dans une projection dextrémité axiale (102) du corps de seringue, ledit dispositif dinjection comportant un dispositif de protection daiguille (200), ledit dispositif de protection étant, dans une position de stockage, fixé sur ledit dispositif dinjection, ledit dispositif de protection étant amovib
