LIQUID TREATMENT APPARATUS

摘要

Provided is a liquid treatment apparatus provided with a cartridge for treating a liquid and a holder for capping the cartridge, wherein the cartridge can be easily removed from the holder and the cartridge is prevented from disconnecting from the holder. A projection (10) projects radially inward from an inner peripheral wall (111w) of an outer cylindrical section (111). A projection (30) is arranged in the circumferential direction of the outer cylindrical section (111) at a position different from the position at which the projection (10) is arranged. A sloping section (81) extends downward, from an upper end (79) to a lower end (78), at a slope along the circumferential direction of an inner cylindrical section (193). A horizontal section (82) extends in the horizontal direction from the lower end (78) of the sloping section (81) along the circumferential direction of the inner cylindrical section (193). A sloping section (84) extends, from an upper end (76) to a lower end (77) along the circumferential direction of the inner cylindrical section (193), at a slope in the circumferential direction of the inner cylindrical section (193).