An injection unit (40) in which workability in maintenance of a load cell is improved is provided. An injection unit includes a cylinder (41, 41B) to which a molding material is supplied, a discharging member (43, 43B) which is provided to freely move forward and backward in the cylinder (41, 41B) and discharges the molding material outside the cylinder by a forward movement of the discharging member (43, 43B), a fixing member (51) to which a rear end section of the cylinder (41, 41B) is attached, a movable member (52) which is provided to freely move forward and backward behind the fixing member (51) and is connected to the discharging member (43, 43B), a movement conversion mechanism (53, 53A) which converts rotation motion of a motor (46) into linear motion of the movable member (52), and a load cell (47) which is attached to both the fixing member (51) and a portion of the movement conversion mechanism (53, 53A), in which the load cell (47) is disposed on the front side of the fixing member (51).