Provided is an insect pest control product which is applicable to a water-based insecticidal composition and can exert stable performance over a long period of time. The insect pest control product comprises a thermal vaporization/diffusion absorbent wick for vaporizing and diffusing a water-based insecticidal composition containing a pyrethroid insecticidal component having a vapor pressure of 2 × 10-4 to 1 × 10-2 mmHg at 30°C, a glycol ether compound having a boiling point of 150-300°C, and water. The thermal vaporization/diffusion absorbent wick has a water/oil-based liquid absorption ratio (V1/V2) within the range of 0.55-1.0, where the water/oil-based liquid absorption ratio (V1/V2) is calculated from a speed (V1) at which a water-based liquid formulation rises through the thermal vaporization/diffusion absorbent wick when a lower portion of the thermal vaporization/diffusion absorbent wick is immersed in the water-based liquid formulation, and a speed (V2) at which an oil-based liquid formulation rises through the thermal vaporization/diffusion absorbent wick when a lower portion of the thermal vaporization/diffusion absorbent wick is immersed in the oil-based liquid formulation, where the water-based liquid formulation is an aqueous solution containing 40 mass% of diethylene glycol monobutyl ether, and the oil-based liquid formulation is a fluid paraffin having 14 carbon atoms.
