To provide a filtration material for filters excellent in mechanical characteristics such as tensile strength while maintaining a function for removing ions in air and water.

A nonwoven fabric is provided from a super high molecular polyolefin having ≥5dl/g intrinsic viscosity [η], preferably has cation exchanging groups and anion exchange groups and produced by using radiation graft method. As the filtration material for filters, the nonwoven fabric is used.