PURPOSE: To finally inject a soft finishing agent at a proper timing so that sufficient soft finishing effect can be provided.

CONSTITUTION: In a one for successively transferring a soft finishing agent to first-fourth chambers 12, 29, 18, 21 according to the progress of processes, and injecting it from an injection hole 24, the fourth chamber 21 is formed to have a flow passage 25 extending in a horizontally long form toward the injection hole 24, and the soft finishing agent is passed through the passage 25, whereby the injection of the soft finishing agent from the injection hole 24 is delayed, so that the soft finishing agent is injected when the water feed of the second rinsing process is carried out to some degree, or at a proper timing as the soft finishing agent flows into this water.