Résumé dans la langue de publication In a method of manufacturing a sintered body of the present invention, a feed stock including metal powder, a binder, and an organic material having a melting point lower than that of the binder is extrusion molded by using an extruder 1, so that an extruded body having a desired shape (cross-sectional shape) and dimensions is manufactured. In this method, the temperature of an extrusion side die 52 of an extrusion die 5 is lower than the melting point of the binder and higher than that of the organic material. Next, a debinding treatment (treatment for removing binder) of the obtained extruded body is performed. The debinding treatment is separately performed in a first step in a low temperature region and a second step in a temperature region higher than that in the first step. Subsequently, an obtained debound body is sintered by baking in a sintering furnace, whereby the sintered body (metal product) is manufactured.