To provide a lid of an operation port which cannot be opened unless the pressure in the interior of a liquid flow type treating apparatus is lowered to a safe region.

The liquid flow type treating apparatus is a liquid flow type treating apparatus for treating a textile product. In the liquid flow type treating apparatus, the lid body 24 for opening and closing the operation port 5 for taking in and out the textile product is pivoted so as to permit only turning on the inside of the operation port 5. Furthermore, the operation port 5 is equipped with an internal cylindrical part 23 and bearing parts 25 in which U-shaped bearing holes 251 are formed are stood on the outer peripheral surface of the internal cylindrical part 23. A shaft supporting part 26 is provided at the lid body 24 for opening and closing the end face 231 of the internal cylindrical part 23 facing the inside of the apparatus and a shaft 27 supported by the shaft supporting part 26 is turnably and slidably passed through the bearing holes 251.