To provide an injection-molding machine capable of preventing the leakage of a molding material from a nozzle during the measuring operation with the molding material leakage-preventing structure which prevents the leakage from the nozzle during measurement of the resin and has a simple structure composed of few components and can be manufactured in a short time.

The injection-molding machine for forming a molded article or a component of an image forming device includes: the first member 2 which has the first surface 3 tilting in a flow direction of a molding material to the flow direction and the second surface 4 capable of contacting the inner surface of the resin flow passage to intercept the flow passage of the resin, and which is disposed at the tip end 1 of the injection mechanism; and an elastic body 5 giving the first member 2 force in such a direction that the flow passage of the resin is intercepted, wherein the pressure working on the contact surface of the first member 2 with the molding material during injection is within the elastic limit of the first member 2.