PROBLEM TO BE SOLVED: To provide a small-sized purifier for a bathtub effectively filtering hot bathwater though an existing afterburning heater can be utilized to sanitarily purity hot bathwater and capable of being repeatedly used as a result and capable of being especially adapted to a unit bath as it is. SOLUTION: A small-sized filter apparatus for a bathtub is constituted of a filter case containing a filter material or activated carbon, an activation case packed with active stones such as ceramics, a shell fossil or granite porphyry, an underwater pump sucking hot bathwater and discharging the same and an air suction device opened to a part of the discharge pipeline of the underwater pump and these components are put in one purifying container having an almost rectangular parallelepiped shape. A plurality of jet nozzles 3, 4 different in jetting direction are selectively attached to the hot bathwater discharge hole 26 formed on one surface of the container and used in a state immersed in hot bathwater of a bathtub (Y).
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