The present invention relates to a volume variable type coffee roaster device, and a roasting device capable of variably controlling the volume of a drum according to an amount of green beans to be roasted.To achieve this, the present invention provides a drum type washing machine, comprising: a cylindrical drum 100 having one side opened to allow introduction and discharge of green beans; A housing 700 for supporting the drum 100 in such a manner as to surround the drum 100 so as to be rotatable; A driving motor 300 for transmitting rotational power to the drum 100 through a belt 310; A heating burner 400 provided at a lower portion of the drum 100 for heating; A movable partition wall 200 provided in the drum 100 so as to be linearly movable and adapted to adjust the inner space; A partition wall moving means connected to the movable partition wall 200 to transmit a linear motion force; An inlet 500 through which fresh beans are introduced into the open inlet side of the drum 100; An opening and closing port 120 which is opened and closed so that the drum heated by the drum 100 can be discharged; And a flue (600) for guiding the smoke generated in the roasting process to the outside in the drum (100).;
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