A dryer comprising: a drum configured to receive a laundry item within its internal volume; a variable member positioned within the drum, configured to be movable in a lengthwise direction of the drum to thereby vary the internal volume of the drum, and comprising a circular plate having an area that corresponds to an internal cross-sectional surface of the drum; a motor disposed on a rear surface of the drum, the motor including a rotation shaft that is configured to rotate in a forward rotation direction or a reverse rotation direction; an adjustment shaft coupled to the rotation shaft and configured to extend to a preset position inside the drum; and a bracket disposed to be fitted to the adjustment shaft and configured to couple the variable member and the adjustment shaft the coupling of the variable member and the adjustment shaft enabling movement of the variable member according to a rotation of the adjustment shaft, the dryer being characterised in that the adjustment shaft further comprises a protrusion pin that extends transversely from one or more sides of the adjustment shaft, and the bracket is coupled to the protrusion pin and configured to move forward or backward along the lengthwise direction of the drum according to a rotation of the protrusion pin; and in that the bracket further comprises: a body member defining a hollow portion, the adjustment shaft being fitted into the hollow portion being configured to receive the adjustment shaft, and a coupling member disposed on one end of the body member, the coupling member extending transversely relative to a lengthwise direction of the body member, and a slot that is defined to extend in a spiral shape, the slot being configured to fittingly receive the protrusion pin being fitted into the slot, and at least a portion of the coupling member is coupled to the variable member; and in that the circular plate is configured to push out the laundry item by moving relative to the drum; and in that the variable member further comprises: a protrusion that protrudes from a center portion of the circular plat, the protrusion defining a hollow portion configured to surround the adjustment shaft. a drum configured to receive a laundry item within its internal volume; a variable member positioned within the drum, configured to be movable in a lengthwise direction of the drum to thereby vary the internal volume of the drum, and comprising a circular plate having an area that corresponds to an internal cross-sectional surface of the drum; a motor disposed on a rear surface of the drum, the motor including a rotation shaft that is configured to rotate in a forward rotation direction or a reverse rotation direction; an adjustment shaft coupled to the rotation shaft and configured to extend to a preset position inside the drum; and a bracket disposed to be fitted to the adjustment shaft and configured to couple the variable member and the adjustment shaft the coupling of the variable member and the adjustment shaft enabling movement of the variable member according to a rotation of the adjustment shaft, the dryer being characterised in that the adjustment shaft further comprises a protrusion pin that extends transversely from one or more sides of the adjustment shaft, and the bracket is coupled to the protrusion pin and configured to move forward or backward along the lengthwise direction of the drum according to a rotation of the protrusion pin; and in that the bracket further comprises: a body member defining a hollow portion, the adjustment shaft being fitted into the hollow portion being configured to receive the adjustment shaft, and a coupling member disposed on one end of the body member, the coupling member extending transversely relative to a lengthwise direction of the body member, and a slot that is defined to extend in a spiral shape, the slot being configured to fittingly receive the protrusion pin being fitted into the slot, and at least a portion of the coupling member is coupled to the variable member; and in that the circular plate is configured to push out the laundry item by moving relative to the drum; and in that the variable member further comprises: a protrusion that protrudes from a center portion of the circular plat, the protrusion defining a hollow portion configured to surround the adjustment shaft. a body member defining a hollow portion, the adjustment shaft being fitted into the hollow portion being configured to receive the adjustment shaft, and a coupling member disposed on one end of the body member, the coupling member extending transversely relative to a lengthwise direction of the body member, and a slot that is defined to extend in a spiral shape, the slot being configured to fittingly receive the protrusion pin being fitted into the slot, and at least a portion of the coupling member is coupled to the variable member; and in that the circular plate is configured to push out the laundry item by moving relative to the drum; and in that the variable member further comprises: a protrusion that protrudes from a center portion of the circular plat, the protrusion defining a hollow portion configured to surround the adjustment shaft. a protrusion that protrudes from a center portion of the circular plat, the protrusion defining a hollow portion configured to surround the adjustment shaft.