To provide an inexpensive catch basin member for use in a drain outlet of a drainage device equipped with a shaft-like body which can be attached and detached without disassembling the drainage device and the like, and hardly incurs a risk of being lost.

This catch basin member for separating dust from discharged water is mounted in the drain outlet of a tub body equipped with the shaft-like body. The catch basin member comprises: a water passage which is integrally composed of a rigid material with moderate elasticity, allows the passage of discharged water, and captures the dust; a through-hole for housing the shaft-like body; a notched portion which is formed at least at the through-hole from the outside surface of the water passage; and an expanded portion which has a bendable connecting portion for connecting the water passages split by the notched portion.