| 摘要 |
[PROBLEMS] To provide a chemical supply unit capable of sustaining the concentration of chemical being supplied from a chemical container at an appropriate level. [MEANS FOR SOLVING PROBLEMS] The chemical supply unit for supplying chemical to liquid flowing intermittently comprises a support (2) for supporting a chemical container (1), a member (5) for guiding the chemical to a position touching the liquid, a section (4) for supplying the chemical to the guide member (5), and a regulation mechanism for holding/discharging the chemical in/from a buffering chamber (6) depending on temperature variation. The buffering chamber (6) comprises a lower member (20) provided in the support, and an upper member (31) being fitted to the lower member from above, wherein the lower member (20) has a bottom wall and an outer sidewall (23) extending upward from the bottom wall, and the upper member (31) has an upper wall (34) covering the upper part of the buffering chamber (6) and an inner sidewall (33) hanging downward from the upper wall and being fitted to the inside of the outer sidewall (23).
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