To provide an airtight thermal insulation unit having airtight performance in addition to thermal insulation performance and improved in work efficiency.
This airtight thermal insulation unit 1 includes: a thermal insulation panel 10 formed with grooves 11, 12 formed at at least opposite edges of the surface; and a connecting panel 20 provided with two legs 22 formed to be fitted to the grooves 11, 12 of the thermal insulation panel 10 at a designated space and adapted to connect the thermal insulation panels 10 to each other by fitting the legs 22 in the grooves 11, 12 of the thermal insulation panel disposed adjacent thereto. The grooves 11, 12 are formed to be curved so that inner parts are wider than inlets, and the legs 22 are formed corresponding to the curved shapes.
MOTODATE SHUICHI