To provide an inexpensive manipulation tool with a simple structure, which is capable of easily and reliably injecting a desired amount of fluid to skin tissue for a short period of time when performing an intradermal injection by a fluid injector using a multi-microneedle device. The above tool (54) is provided with a mechanism (58) sequentially moving the injector (52) in a housing space (56c) of an outer cylinder (56) among an initial position in which needles (50c) of a main body (50b) of the device are retracted inside one end opening of the space, a first position in which the needles protrude to the outside from the opening by a first given distance, and a second position in which needles protrude to the outside by a second given distance shorter than the first given distance, in which the fluid flows from the injector through the needles in the second position, and the mechanism has a unit (58a) biasing the injector toward the initial position by a magnetic force between the outer cylinder and the injector, first and second stoppers (58b, 58c) which can be selectively extended/retracted with respect to the outer peripheral wall of the outer cylinder and an engaging portion (58d) which is selectively engaged with these stoppers on the outer peripheral wall of the injector and selectively arranging the injector in the above three positions.
