Injection device of fluid product (100) comprising a syringe body (101) and a needle (110) fixed in an axial end projection (102) of the syringe body, said injection device comprising a needle protection device (200), said protection device being, in a storage position, fixed on said injection device, said protection device being removable from said injection device, said protection device comprising an inner body (210) made of substantially supple and/or deformable material and an outer body (220) made of substantially rigid material, said inner body (210), in a storage position, sealingly closing the distribution orifice (111) of said needle (110) and sealingly cooperating with said injection device (100), and said outer body (220) in a storage position, cooperating with said injection device (100) to fix said protection device (200) onto said injection device (100), characterized in that said outer body (220) comprises a fixing part (228) fixed to said injection device (100) and a protection part (229) fixed to said inner body (210), said protection part (229) being connected to said fixing part (228) by at least one breakable material bridge (227), said at least one breakable material bridge (227) being broken to remove said protection part (229) and said inner body (210) from said injection device (100).
