Abstract: The present invention relates to a coffee roaster that roasts coffee beans by using heat emitted from a gas burner and a ceramic dome and has a hot water tank supplying hot water to coffee, wherein a rotary shaft rotating a roasting drum is rotatably supported on a base groove formed on the top surface of a base rod and a support groove formed on the bottom surface of a support rod, thereby permitting the rotary shaft to be removably mounted thereon, and wherein a heat-absorbing pipe is disposed in a high-temperature space between the gas burner and the inner wall surface of the ceramic dome, so as to allow a heat transfer medium to be forcedly circulated therethrough, and a heat-generating pipe disposed on a lower portion of a hot water tank in such a manner as to be submerged into the water in the hot water tank.