A spun yarn drawing apparatus comprising: a thermal insulation box which includes a yarn inlet through which yarns are introduced and a yarn outlet through which the yarns go out; and heating rollers (31 to 35) which are accommodated in the thermal insulation box and are configured to feed the yarn in a yarn running direction that is a direction toward the yarn outlet from the yarn inlet, while heating the yarns, the heating rollers (31 to 35) including a first heating roller which is provided on the most upstream side in the yarn running direction, a second heating roller which is provided on the downstream side of the first heating roller in the yarn running direction and is higher in yarn feeding speed and in temperature than the first heating roller, and at least one third heating roller (32, 33, 34) which is provided between the first heating roller and the second heating roller in the yarn running direction, a guide path for guiding air being provided in the internal space of the thermal insulation box to have an inlet which is provided to be closest to the second heating roller among the heating rollers (31 to 35) and an outlet which is provided to be closest to the first heating roller among the heating rollers (31 to 35), the inlet at least partially overlapping a region extending along an axial direction of the second heating roller when viewed in a direction orthogonal to the axial direction of the second heating roller, and the outlet at least partially overlapping a region extending along an axial direction of the first heating roller when viewed in a direction orthogonal to the axial direction of the first heating roller. a thermal insulation box which includes a yarn inlet through which yarns are introduced and a yarn outlet through which the yarns go out; and heating rollers (31 to 35) which are accommodated in the thermal insulation box and are configured to feed the yarn in a yarn running direction that is a direction toward the yarn outlet from the yarn inlet, while heating the yarns, the heating rollers (31 to 35) including a first heating roller which is provided on the most upstream side in the yarn running direction, a second heating roller which is provided on the downstream side of the first heating roller in the yarn running direction and is higher in yarn feeding speed and in temperature than the first heating roller, and at least one third heating roller (32, 33, 34) which is provided between the first heating roller and the second heating roller in the yarn running direction, a guide path for guiding air being provided in the internal space of the thermal insulation box to have an inlet which is provided to be closest to the second heating roller among the heating rollers (31 to 35) and an outlet which is provided to be closest to the first heating roller among the heating rollers (31 to 35), the inlet at least partially overlapping a region extending along an axial direction of the second heating roller when viewed in a direction orthogonal to the axial direction of the second heating roller, and the outlet at least partially overlapping a region extending along an axial direction of the first heating roller when viewed in a direction orthogonal to the axial direction of the first heating roller.