PROBLEM TO BE SOLVED: To provide a coating apparatus having a jacket-less structure of possessing no jacket for air permeation channels and unlikely to entail leaks of exhaust gases or short paths.SOLUTION: The partition unit 14 configured on the circumferential wall portion 1a of a rotary drum 1 comprises a base 14a fixed to the inner circumference of the circumferential wall portion 1a and a seal member 14b fitted to the base 14a in a state where its inward movement away from and outward movement toward the circumferential plane of the circumferential wall portion 1a are permitted. The seal member 14b moves, upon the reception of a force directed outward toward the circumferential plane, outward toward the circumferential plane while sliding against and contacting one or the other plane of the base 14a, and its distal end portion is pressed against and contacted with the slide contact portion 10a of an air permeation member 10 under a force commensurate with the former force.COPYRIGHT: (C)2014,JPO&INPIT【課題】通気チャンネル用のジャケットを有しないジャケットレス構造で、排気の漏れやショートパスが発生しにくいコーティング装置を提供する。【解決手段】回転ドラム1の周壁部1aに設けられた仕切り部14は、周壁部1aの外周に固定された基部14aと、基部14aに、周壁部1aの内外周方向への移動が許容された状態で装着されたシール部材14bとを備えている。シール部材14bは、外周方向に向いた力を受けると、基部14aの一面又は他面と摺接しながら外周方向に移動し、上記の力に見合う力で、その先端部が通気部材10の摺接部10aに圧接する。【選択図】図4