Fuel Injection Valve

A fuel injection valve is provided that includes a valve seat member ( 3 ) having a conical valve seat ( 8 ) and a valve hole ( 7 ) formed through a central part of the valve seat ( 8 ), a valve body ( 18 ) working in cooperation with the valve seat ( 8 ), and an injector plate ( 10 ) joined to the valve seat member ( 3 ) and having a plurality of fuel injection holes ( 11 ) radially outwardly displaced from the valve hole ( 7 ), a diffusion chamber ( 39 ) providing communication between the valve hole ( 7 ) and the fuel injection holes ( 11 ) being provided between the valve seat member ( 3 ) and the injector plate ( 10 ), wherein the diffusion chamber ( 39 ) formed between the valve seat member ( 3 ) and the injector plate ( 10 ) is in an annular shape, has a diameter that is larger than that of the valve hole ( 7 ), and has inner ends of the fuel injection holes ( 11 ) opening therein, and a plurality of fuel passages ( 42 a , 42 b) are disposed within the valve hole ( 7 ), the plurality of fuel passages ( 42 a , 42 b) reversing within the valve hole ( 7 ) fuel that has passed through the valve seat ( 8 ) and guiding the fuel to the diffusion chamber ( 39 ). This enables atomization of injected fuel to be promoted and penetrability to be improved for the fuel injection valve.