An apparatus for injecting fuel into the combustion chamber of an internal combustion engine includes an injection nozzle (5) having an axially displaceable nozzle needle (17) to which the pressure present in a control chamber (13) when filled with fuel, can be applied in the axial direction to control the opening and closing movements of the needle. The pressure in the control camber (13) is controlled via a solenoid valve (7) opening or closing at least one inlet or outlet duct for fuel. A magnetic coil (28) cooperates with an armature (27) and a valve-closing member is coupled to the armature (27) and that can be pressed against a valve seat (15). The armature (27) is disposed in an armature chamber (19) into which the inlet or outlet duct (14) opens. The magnetic coil (28) is covered by a metal protective plate (30) on the side of the armature chamber.