Abstract: Disclosed is a roaster/roasting machine for roasting an edible plant such as coffee beans. This roaster/roasting machine comprises a roasting chamber for containing a substance to be roasted, the roasting chamber being made of a carbon material (graphite, CC composite, etc.). Thus, the roaster/roasting machine can utilize far-infrared rays for roasting with a simple structure. A roaster comprising an open top container body and a closure member may be used for home roasting. A roasting machine comprising a drum-shaped roasting chamber may be a professional roasting machine. The present invention can be applied to any of a direct-, semi-hot air-, and hot air-heating type roaster/roasting machine. Also disclosed is a method for roasting beans such as coffee beans, the method comprising contacting beans with a heated graphite.