PROBLEM TO BE SOLVED: To provide a fluid injection device suitable for continuous injection of pulsation flow in a state of desired injection force maintained.SOLUTION: A fluid injection device 1 is configured so as to include: a fluid injection section 2 having a fluid chamber 501 having volume capable of being changed, an inlet flow passage 503 and an outlet flow passage 511 communicating with the fluid chamber 501, a pulsation generation section 100 including a piezoelectric element 401, a connection flow passage 201 having one end portion communicating with the outlet flow passage 511 and the other end portion provided with a fluid injection opening portion 212, a connection flow passage piping 200 transmitting pulsation from the fluid chamber 501 to the fluid injection opening portion 212, and a pump 20 supplying fluid and a drive section 30 supplying a driving signal to the piezoelectric element 401. Further, the drive section 30 controls supply contents of the driving signal constituted of a signal waveform including compression drive waveform portions driving the piezoelectric element 401 so as to compress the volume such that the fluid flowing toward the fluid chamber 501 returns to a steady state prior to individual supplies of the compression drive waveform portions continuously supplied.
