PROBLEM TO BE SOLVED: To improve ejection intensity of fluid.SOLUTION: A fluid ejection device includes: a fluid chamber configured to store the fluid； a nozzle configured to eject the fluid stored in the fluid chamber； a fluid supply channel connected to the fluid chamber in a predetermined direction and configured to supply the fluid to the fluid chamber； an air bubble generating member configured to generate air bubbles in the fluid chamber； and a partition wall configured to partition the fluid chamber and the fluid supply channel, support the air bubble generating member and have at least one hole communicating the fluid chamber with the fluid supply channel. A value obtained by a total area of the hole on a cross-sectional surface perpendicular to the predetermined direction being divided by a length of the hole in the predetermined direction is made to be smaller than a value obtained by a cross-sectional area of the nozzle on the cross-sectional surface being divided by a length of the nozzle in the predetermined direction.【課題】流体の噴射強度の向上を図る。【解決手段】流体を収容する流体室と、流体室に収容された流体を噴射するノズルと、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と、流体室内に気泡を発生させる気泡発生部材と、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
