PROBLEM TO BE SOLVED: To provide an injector easily injecting an injection solution according to various purposes and improving convenience of a user.SOLUTION: The injector includes a holding part for storing an injection objective substance, a drive part for imparting injection energy, a nozzle part including a flow passage for the injection, and a power supply part for supplying power to the drive part, with their independently loaded with respect to a housing, so as to form a state enabling injection of the injection objective substance. The injector further includes regulation means for regulating loading positions of the holding part and the drive part with respect to the housing so as to form such a loading state that the holding part and the drive part are constantly loaded in a housing in a same alignment. Further, the power supply part is positioned at a prescribed loading position with respect to the housing.SELECTED DRAWING: Figure 2
