FUEL INJECTION VALVE

PROBLEM TO BE SOLVED: To heat a fuel.SOLUTION: When a needle valve 135 is seated on a valve seat part, a space S2 blocked from a fuel injection hole 131a is formed between the needle valve 135 and a valve seat 137. When the needle valve 135 is separated from the valve seat part, the space S2 is communicated with the fuel injection hole 131a. A fuel is supplied to the space S2. A fuel injection valve 100 comprises a light transmissive member 161 which is disposed in contact with a top face of the valve seat 137. The light transmissive member 161 closes an opening formed from an outer side face of the needle valve 135 and an inner side face of a nozzle body part 131. The valve seat 137 includes an extension passage extending from the space S2 to the light transmissive member 161. A distal end (namely, a light irradiation part 150b) of a light transmission part 150 transmitting a light that is generated by a light source part 120, is disposed at such a position that the inside of the extension passage can be irradiated with the light through the light transmissive member 161.SELECTED DRAWING: Figure 2 【課題】燃料を加熱する。【解決手段】ニードル弁１３５が弁座部に着座したとき、ニードル弁１３５とバルブシート１３７との間に「燃料噴射孔１３１ａと遮断された空間Ｓ２」が形成される。ニードル弁１３５が弁座部から離間したとき、空間Ｓ２と燃料噴射孔１３１ａとが連通する。空間Ｓ２には燃料が供給される。燃料噴射弁１００は、バルブシート１３７の上面に接するように配設された光透過性部材１６１を備える。光透過性部材１６１は、ニードル弁１３５の外側の側面とノズル本体部１３１の内側の側面とにより形成される開口を閉じる。バルブシート１３７は、空間Ｓ２から光透過性部材１６１まで伸びる延長通路を備える。光源部１２０にて発生した光を伝達する光伝達部１５０の先端（即ち、光照射部１５０ｂ）は、光透過性部材１６１を通して延長通路内に光を照射可能な位置に配置される。【選択図】図２