A needleless syringe comprises a main syringe body which is a main body thereof and which has, in the main body, a sliding movement passage connected to an opening provided on a front end surface of the main body； a holding unit which is arranged slidably in the sliding movement passage and which has an accommodating unit for accommodating an injection objective substance so that the injection objective substance is releasable； and a driving unit which applies energy to the holding unit in order to allow the holding unit to slide toward the opening. The opening is arranged so that the opening adjoins the accommodating unit when the holding unit is at an abutment position at which the holding unit abuts against the opening and sliding movement thereof is inhibited in the sliding movement passage； and the accommodating unit is formed so that the accommodating unit does not penetrate in an axial direction of the holding unit. Thus, when the energy is applied by the driving unit to the holding unit disposed at the initial position, then the holding unit slides in the sliding movement passage to abut against the opening at the abutment position, and thus the injection objective substance accommodated in the accommodating unit is discharged via the opening. Accordingly, the high injection performance of the needleless syringe is appropriately exhibited.
