A thread material cutting device 90 is provided which is used in an extraction bag sheet manufacturing apparatus, the thread material cutting device having a compact apparatus configuration without the use of a cutter. An extraction bag manufacturing apparatus with the thread material cutting device 90 incorporated therein includes welding means (first sealing device 61) in which tags 2 retained on a carrying face of a carrier 10 at prescribed intervals and a thread material 3 arranged so as to be placed over the tags 2 are press-heated and thereby welded on the carrier 10. The thread material cutting device 90 has tension application means such as a pressing plate 91 configured to engage with the thread material 3 placed between adjacent tags 2 so as to apply tension to the thread material 3. While the welding means is press-heating the thread material onto the tags, the tension application means applies tension to the thread material 3 so as to cut the thread material 3.
