A spun yarn drawing apparatus comprising: at least one preheating roller (31 - 33) which heats yarns (Y) before drawn; at least one conditioning roller which is provided downstream in a yarn running direction of the at least one preheating roller (31 - 33) and is higher in temperature and speed than the at least one preheating roller (31 - 33); and a thermal insulation box which houses the at least one preheating roller (31 - 33) and the at least one conditioning roller , the yarns (Y) being drawn between the at least one preheating roller (31 - 33) and the at least one conditioning roller , the spun yarn drawing apparatus further including: at least one partition portion provided between the at least one preheating roller (31 - 33) and the at least one conditioning roller ; and a communication passage which causes a low-temperature space which is on the preheating roller (31 - 33) side of the at least one partition portion to communicate with a high-temperature space which is on the conditioning roller side of the at least one partition portion ; characterized in that at least one shutter is provided to change the flow passage area of the communication passage , and wherein, the communication passage is a passage formed at a location different from a yarn path between the at least one preheating roller (31 - 33) and the at least one conditioning roller . at least one preheating roller (31 - 33) which heats yarns (Y) before drawn; at least one conditioning roller which is provided downstream in a yarn running direction of the at least one preheating roller (31 - 33) and is higher in temperature and speed than the at least one preheating roller (31 - 33); and a thermal insulation box which houses the at least one preheating roller (31 - 33) and the at least one conditioning roller , the yarns (Y) being drawn between the at least one preheating roller (31 - 33) and the at least one conditioning roller , the spun yarn drawing apparatus further including: at least one partition portion provided between the at least one preheating roller (31 - 33) and the at least one conditioning roller ; and a communication passage which causes a low-temperature space which is on the preheating roller (31 - 33) side of the at least one partition portion to communicate with a high-temperature space which is on the conditioning roller side of the at least one partition portion ; characterized in that at least one shutter is provided to change the flow passage area of the communication passage , and wherein, the communication passage is a passage formed at a location different from a yarn path between the at least one preheating roller (31 - 33) and the at least one conditioning roller . at least one partition portion provided between the at least one preheating roller (31 - 33) and the at least one conditioning roller ; and a communication passage which causes a low-temperature space which is on the preheating roller (31 - 33) side of the at least one partition portion to communicate with a high-temperature space which is on the conditioning roller side of the at least one partition portion ; characterized in that at least one shutter is provided to change the flow passage area of the communication passage , and wherein, the communication passage is a passage formed at a location different from a yarn path between the at least one preheating roller (31 - 33) and the at least one conditioning roller . <EOS>