To provide an insecticide transpirator having an appearance of nature intention, slight environmental loading in disposal besides gradual volatilization of insecticide continuously for a long period of time.

The insecticide transpirator forms a hollow part 12 inside a main body part 11 constituted of lumber, is equipped with a vent hole 13 for communicating the outside of the main body part 11 with the hollow part 12 and stores a sublimating insecticide in the hollow part 12. The stored insecticide sublimates (vaporization) until the insecticide reaches a saturated vapor pressure in the hollow part 12 and the vaporized insecticide of saturated vapor pressure is released through the vent hole 13 for communicating the hollow part 12 with the outside. Since the amount of sublimation (vaporization) is determined by the volume of the hollow part 12 and the hollow part 12 is maintained at the saturated vapor pressure, the insecticide having a constant concentration is volatilized from the vent hole 13. Since when a sublimated amount is increased, the insecticide is precipitated on the inner wall of the hollow part 12 and the vent hole 13, the insecticide is not volatilized than necessary.