Contour of a storage section of a three-sided bag is formed of two side inner lines in a longitudinal direction, two tilt inner lines which tilt inside with forming an obtuse angle with each side inner line from a lower end of each side inner line, and one lower side inner line in a lateral direction which connects lower ends of respective tilt inner lines. The focal-point detection area may be set so as to fit within the angle of view after the moving-image recording operation. The vehicles may be coupled to the cables by clamping devices and the cables overlap one another in mutually associated end regions. 1 Hz and most preferably around 9. Each actuator has a serpentine heater element configured to expand thermally upon receiving current from the drive circuitry thereby moving said actuators into the chamber to increase a fluid pressure inside the chamber to eject a drop of ink via the ejection nozzle.