Fluid injection nozzle

A fluid injection nozzle comprising:

• a valve body having an inner circumference forming a fluid passage and converging toward a fluid downstream side, and having a valve seat on said inner circumference;
• an injection port plate arranged on the fluid passage downstream side of said valve seat and having an injection port for injecting a fluid to flow out of said fluid passage;
• and
• a valve member for shutting said fluid passage, when seated on said valve seat, and for opening said fluid passage when unseated from said valve seat, wherein
• an injection port axis joining a center of an fluid inlet and a center of a fluid outlet of said injection port is inclined with respect to a center axis of said injection port plate,
• two lines of intersection between a virtual plane containing said injection port axis and normal to said injection port plate and an injection port inner circumference of said injection port plate forming said injection port are inclined in a same direction as that of said injection port axis with respect to said center axis, and
• when a first intersection line formed on an obtuse angle side by said injection port axis and a fluid inlet side end face of said injection port plate has a first angle of inclination θ1 with respect to said center axis and when a second intersection line formed on an acute angle side by said injection port axis and the fluid inlet side end face has a second angle inclination θ2, θ1<θ2.