A fluid injection device includes: a pulse generation section (100) that includes a fluid chamber (501, 551), and an inlet flow passage (503, 521, 558) and an outlet flow passage (511) a first connection flow passage (201) connected to the outlet flow passage (511), having an end portion a second connection flow passage (504) connected to the inlet flow passage (503, 521, 558) a fluid injection opening (212) formed at the end portion of the first connection flow passage (201), having a diameter smaller than the diameter of the outlet flow passage (511) a connection flow passage tube (200) including the first connection flow passage (201) and having rigidity adequate to transmit pulses of fluid flowing from the fluid chamber (501, 551) to the fluid injection opening (212) and a pressure generation section (20) that supplies fluid to the inlet flow passage (503, 521, 558).
