DRAIN FILTER FOR RAINWATER PERMEATION PIPE

PROBLEM TO BE SOLVED: To provide a drain filter capable of discharging rainwater stagnating in an earth and sand pool.SOLUTION: There is provided the drain filter used for a rainwater permeation structure constituted by opening a bottom part of a gutter box and arranging a permeation pipe WP penetrating the opening in the ground. The drain filter includes a cylindrical body part 1 which is mounted at an upper end of the permeation pipe and has permeation holes 4 bored in a side wall at a plurality of positions, a filter material 2 arranged in the body part, a filter support part 3 which is provided detachably to the body part while supporting the filter material, and an air permeation member 5 which penetrates the filter material.