PROBLEM TO BE SOLVED: To provide a treatment agent for a polyolefin-based synthetic fiber capable of adding high level hydrophilicity to a resulting unwoven fabric while maintaining good antistaticity or card passing property and making the nonwoven fabric weak acidic, an aqueous liquid of the treatment agent, a treatment method of the polyolefin-based synthetic fiber using the aqueous liquid, the polyolefin-based synthetic fiber with the treatment agent adhering thereto and a thermal bond nonwoven fabric made from the polyolefin-based synthetic fiber.SOLUTION: As a treatment agent for a polyolefin-based synthetic fiber, one containing a specific organic acid of 0.1 to 20 mass%, an alkyl phosphoric acid ester salt B with 4 to 11 carbon atoms of 10 to 50 mass%, an alkyl phosphoric acid ester salt C with 12 to 22 carbon atoms of 10 to 50 mass% and a specific polyoxyalkylene derivative of 20 to 75 mass% (total 100 mass%) is used.SELECTED DRAWING: None
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