PROBLEM TO BE SOLVED: To provide a fluid injection device improving injection strength of fluid.SOLUTION: A fluid injection device comprises: a fluid chamber 131 storing fluid a nozzle 132 injecting the fluid stored in the fluid chamber 131 a fluid supply passage 121 being connected to the fluid chamber 131 in a predetermined direction and supplying the fluid to the fluid chamber 131 an air bubble generation member 31 generating air bubbles in the fluid chamber 131 and a partition wall portion 140 separating the fluid chamber 131 and the fluid supply passage 121, supporting the air bubble generation member 31 and having at least one hole causing the fluid chamber 131 and the fluid supply passage 121 to communicate with each other. A value obtained by dividing a total cross-sectional area of the hole in a cross section perpendicular to the predetermined direction by length of the hole in the predetermined direction is less than a value obtained by dividing a cross-sectional area of the nozzle 132 in the cross section by length of the nozzle 132 in the predetermined direction.COPYRIGHT: (C)2016,JPO&INPIT【課題】流体の噴射強度を向上した流体噴射装置を提供する。【解決手段】流体を収容する流体室131と、流体室に収容された流体を噴射するノズル132と、所定方向において流体室と接続し、流体室に流体を供給する流体供給路121と、流体室内に気泡を発生させる気泡発生部材31と、流体室と流体供給路とを隔て、かつ、気泡発生部材を支持し、かつ、流体室と流体供給路とを連通する孔を少なくとも一つ有する隔壁部140と、を備え、所定方向と直交する断面における孔の総断面積を、所定方向における孔の長さで除算した値が、断面における前記ノズルの断面積を、所定方向におけるノズルの長さで除算した値よりも小さくなるようにした。【選択図】図2
