To provide a filter for drain capable of preventing a danger from being felt even when the filter is put on a catch basin set on a generally flat floor surface and capable of being easily installed on various types of catch basins.

This filter for drain comprises a substrate part 1; an arch-shaped connection member 2 for connecting the generally opposed portions of the substrate part to each other and formed in a chevron shape; and a center member 3 installed at the central part of the arch-shaped connection member. The center member 3 comprises a filter locking part for mounting, by insertion, one end part 7b of a particulate collecting filter 7. A plurality of pins 5 allowed to be inserted into the holes 8a of the catch basin 8 are installed in the center member 3 so as to be moved forward and backward.