To provide a circulating implement for a bathtub that can improve manufacturing efficiency to reduce a manufacturing cost by simplifying constitution while having durability by reinforcing an elastic deformation part.

The inner peripheral surface of a filter cover mounted to the outer surface of an adapter 16 of the circulating implement for the bathtub is provided with an engaging projection projected radially inward, and an outer peripheral part of the adapter 16 is provided with the elastic deformation part 41 cantilever-supported to an adapter body 16a, circumferentially extended and elastically deformed in a radial direction. The outer peripheral surface of the elastic deformation part 41 is provided with a guide groove 44 axially extended to guide the engaging projection, an axially extended locking projection 45; a holding groove 46; and a circumferentially extended regulating piece 47 and an axially extended regulating projection 48 for regulating the slip-out of the engaging projection. A reinforcing rib 49 formed in V-shape and having resilience is integrally erected between the elastic deformation part 41 and the adapter body 16a.

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