Thread collecting device

A device that collects a silk thread(s) from a bagworm(s), the device comprising:

• a container that accommodates the bagworm;
• and
• an in-and-out hole through which the bagworm is put in and taken out of the container,
• wherein
• a width of a maximum short axis cross section of an inner space of the container is
• in a range from 10.8 mm to 27.5 mm if a maximum body width of a last instar bagworm about to be accommodated in the container is in a range from 9.0 mm to 11.0 mm, or
• in a range from 8.4 mm to 21.3 mm if a maximum body width of a last instar bagworm about to be accommodated in the container is in a range from 7.0 mm to 8.5 mm,
• wherein the maximum body width is a maximum body width among a width of the cross section including the short axis perpendicular to the long axis from a head tip portion to a tail tip portion,
• wherein
• the container has a discharge hole at a bottommost portion, and
• the discharge hole has a minimum width longer than a maximum width of excrement of the bagworm being accommodated and a maximum width shorter than a maximum width of a head of the bagworm being accommodated. and
• wherein the container includes an encapsulating unit configured to encapsulate the bagworm.