PROBLEM TO BE SOLVED: To provide a fluid injection device temporarily alleviating injection force due to a high pressure.SOLUTION: A fluid injection device comprises: a fluid injection section injecting pulse-like fluid； a fluid supply section having a fluid storage section storing the fluid having a pressure equal to a predetermined pressure or more and supplying the fluid stored in the fluid storage section to the fluid injection section； a connection flow passage connecting the fluid injection section and the fluid storage section and becoming a flow passage where the fluid flows； an open/close section opening and closing the connection flow passage； and a control section transmitting an opening signal for opening the connection flow passage to the open/close section and transmitting an injection signal for injecting the fluid to the fluid injection section. The control section transmits the injection signal after a predetermined period of time has elapsed since the opening signal was transmitted.【課題】一時的に高い圧力による噴射力を緩和した流体噴射装置を提供する。【解決手段】パルス状の流体を噴射させる流体噴射部と、所定圧力以上の圧力の流体を収容する流体収容部を有し、流体収容部に収容された流体を流体噴射部に供給する流体供給部と、流体噴射部及び流体収容部を接続し、流体が流れる流路となる接続流路と、接続流路を開閉する開閉部と、開閉部に対して、接続流路を開放させるための開放信号を送り、流体噴射部に対して、流体を噴射させるための噴射信号を送る制御部とを備えた流体噴射装置であって、制御部は、開放信号を送ってから所定時間経過後に、噴射信号を送る。【選択図】図９
