Filtering device, purification device, and method for manufacturing chemical liquid

A filtering device for manufacturing a chemical liquid for manufacturing a semiconductor substrate by purifying a liquid to be purified, the filtering device comprising:

• an inlet portion;
• an outlet portion;
• a filter A;
• at least one filter B different from the filter A;
• and
• a flow path which includes the filter A and the filter B arranged in series and extends from the inlet portion to the outlet portion,
• wherein the filter A has a porous membrane made of ultra-high-molecular-weight polyethylene and a resin layer disposed to cover at least a portion of a surface of the porous membrane, and
• the resin layer includes a resin having a neutral group or an ion exchange group.