To provide a backpack of a carbon dioxide gas cylinder capable of carrying a bottle or the like filled with cryogenic carbon dioxide without any problems, capable of performing insecticidal work, checking of a cylinder, replacement of a cylinder or the like without difficulty.A body frame (12) having a bottom plate part, a backpack frame part raised from the bottom plate part, and a side frame part formed by bending both sides of the backing frame part, a main frame (12) rising from a substantially central position of the bottom plate part A holding mechanism of a carbon dioxide gas cylinder having an upper holding cylinder of a carbon dioxide gas cylinder 15, an upper holding cylinder of a carbon dioxide gas cylinder, and attaching / detaching means for detachably connecting the upper holding cylinder to the lower holding cylinder, a heat insulating layer , And a heat insulation cover 14 attached with a back string on the back, and the main frame was housed in a heat insulation cover so that one person could carry it on the back.(FIG. 10)【課題】極低温の炭酸ガスを充填したボンベ等を問題なく背負うことができ、殺虫作業やボンベの点検、あるいはボンベの取り換え作業等を無理なく行うことができる炭酸ガスボンベの背負い具を提供する。【解決手段】底板部と、底板部から立ち上げた背負いフレーム部と、背負いフレーム部の両側を折り曲げて形成した側面フレーム部とを備えた本体フレーム12と、底板部のほぼ中央位置から立ち上げた炭酸ガスボンベ15の下部収納筒と、炭酸ガスボンベの上部保持筒と、下部収納筒に上部保持筒を着脱自在に連結する着脱手段を備えた炭酸ガスボンベの保持機構と、内面に断熱層を形成し、背面に背負い紐を取り付けた断熱カバー14とを備え、本体フレームを断熱カバーに収納し、人一人が背負って運べるようにした。【選択図】図10
