Provided is a twin roll casting machine which can reduce an amount of inert gas supplied. <??>A duct 19 is upwardly urged by cylinders 24 to compress resilient sealing members 22 and 23 respectively between a flange 30 on a casting module 3 and an upper flange 20 on the duct 19 and between a lower flange 21 on the duct 19 and a lower surface on a peripheral edge of an upper-end opening of an enclosure 5 to maintain air-tightness of connections between the casting module 3 and the duct 19 and between the duct 19 and the enclosure 5. <??>The scrap box 7 is moved upward by jacks 6 to make a lower edge of a partition plate of an upper sealing member 29 on the enclosure 5 penetrate into the sealing material 27 stored in a groove on the scrap box 7 to maintain air-tightness of a connection between the scrap box 7 and the enclosure 5. <IMAGE>
