Nozzle body, the valve assembly and fluid injection valve

A nozzle body (1) for a fluid injection valve is disclosed. In addition, a valve assembly (5) and a fluid injection valve are disclosed. The nozzle body (1) has a cavity (10) and a bottom wall (20) delimiting the cavity (10) at a fluid outlet end (15). The bottom wall (20) is perforated by an injection hole (25) which has an inlet opening (250) at an inner surface (210) of the bottom wall (20) and an outlet opening (255) at an outer surface (215) of the bottom wall (20). The outlet opening (255) is in the shape of an elongated slit having a centerline (255C) which is a circular arc with respect to the longitudinal axis (L). The inlet opening (250) is spaced apart from the longitudinal axis (L) by a radial distance (DRI). The inner surface (250) has a concave shape extending away from the fluid outlet end (15) from an apex (212) of the inner surface (210. Further, the inlet opening (250) is spaced apart from the apex (212) by an axial distance (DAI) which is smaller than said radial distance (DRI).