Abstract: The device (1) for ejecting a liquid or pasty product, comprises a body (2), a part intended to contain the product and equipped with an orifice for ejecting the product, a drive cylinder (3) equipped with teeth (10), moving in a bore (23) passing through the body and causing the volume of the part intended to contain the product to vary and a mechanism for displacing the drive cylinder attached to the body, and comprises an articulated lever (4) acting on the teeth of the drive cylinder through an articulated pawl (16) articulated to the lever (4) and returned to a position of contact with the drive cylinder and a nonreturn pawl (18) returned to a position of contact with the drive cylinder. It is one wherein the lever (4) is connected to the body by means of a joint (14, 15) that can be dislocated.