A flow rate adjusting device includes a main body portion including a supply flow path formed with a first opening through which a plasticized material obtained by plasticizing at least a part of a material containing a metal particle is supplied and a second opening through which the plasticized material is ejected, and an intersecting hole intersecting the supply flow path; a tubular sleeve disposed inside the intersecting hole and including a through-hole at a position overlapping the supply flow path; and a shaft-shaped valve unit disposed inside the sleeve, wherein the valve unit includes a concave portion at a position overlapping the supply flow path, and rotates inside the intersecting hole for changing a position of the concave portion, to change a flow path cross-sectional area of the supply flow path for adjusting a flow rate of the plasticized material ejected from the second opening.

A material supplying device includes a plasticizing section configured to plasticize a material to generate a plasticization material; a nozzle configured to supply the plasticization material to the outside; a supply control mechanism that is provided in a flow path communicating with the plasticizing section and the nozzle, and that is configured to adjust a supply amount of the plasticization material from the nozzle to the outside; a pressure sensor configured to measure the pressure of the plasticization material in the flow path; and a control section configured to control an operation of the supply control mechanism, wherein the control section is configured to calculate a backlash value indicating backlash of the supply control mechanism based on detection data including a detection value output from the pressure sensor, and the detection data is data including in time series the detection values output from the pressure sensor.