FUEL INJECTION DEVICE

To provide a fuel injection device which can inject high-pressure fuel while suppressing the leakage of fuel to the outside of a housing from a fuel passage.SOLUTION: An inside protrusion 60 is cylindrically protruded from an end face 221 of a second cylinder member 22 at a third cylinder member 23 side, and integrally formed at the second cylinder member 22 so as to be connected to the third cylinder member 23. An outside protrusion 70 is cylindrically protruded from an end face 231 of the third cylinder member 23 at the second cylinder member 22, and integrally formed at the third cylinder member 23 so as to be connected to the second cylinder member 22 so that its inner wall abuts on an outer wall of the inside protrusion 60. An inside protrusion 80 is cylindrically protruded from an end face 222 of the second cylinder member 22 at the first cylinder member 21 side, and integrally formed at the second cylinder member 22 so as to be connected to the first cylinder member 21. An outside protrusion 90 is cylindrically protruded from an end face 211 of the first cylinder member 21 at the second cylinder member 22 side, and integrally formed at the first cylinder member 21 so as to be connected to the second cylinder member 22 so that its inner wall abuts on an outer wall of the inside protrusion 80.SELECTED DRAWING: Figure 2 【課題】燃料通路からハウジング外部への燃料の漏れを抑制しつつ高圧の燃料を噴射可能な燃料噴射装置を提供する。【解決手段】内側突出部６０は、第２筒部材２２の第３筒部材２３側の端面２２１から筒状に突出し第３筒部材２３に接続するよう第２筒部材２２と一体に形成される。外側突出部７０は、第３筒部材２３の第２筒部材２２側の端面２３１から筒状に突出し第２筒部材２２に接続し内壁が内側突出部６０の外壁に当接するよう第３筒部材２３と一体に形成される。内側突出部８０は、第２筒部材２２の第１筒部材２１側の端面２２２から筒状に突出し第１筒部材２１に接続するよう第２筒部材２２と一体に形成される。外側突出部９０は、第１筒部材２１の第２筒部材２２側の端面２１１から筒状に突出し第２筒部材２２に接続し内壁が内側突出部８０の外壁に当接するよう第１筒部材２１と一体に形成される。【選択図】図２