Fuel injector valve

The fuel injection valve (1) has a switching valve (6) which is arranged in a top end housing part and a nozzle body (3) which is connected with the top end housing part over a retaining body. A nozzle needle (13) is arranged in the nozzle body. The retaining body has a control chamber bore (20) with a front surface (25) of the nozzle needle, which limits a control chamber (26). A filler piece (30) is arranged in the control chamber.