PROBLEM TO BE SOLVED: To provide a steam-heating insect-exterminating device for Ceratitis capitata, Bactrocera dorsalis, Bactrocera tryoni, Bactrocera cucurbitae, and the like, by setting the time for elevating temperature to reach a fruit central temperature prescribed for each of the fruits housed in each housning means at an almost same time to prevent thermal damages. SOLUTION: This steam-heating device is provided by controlling a steam-supplying means C4 and a heat-exchanging means 4 based on a detected signal of a fruit temperature-detecting means when the temperature elevation of the fruit central temperature in a certain fruit-housing part 31 is delayed as compared with the temperature elevation of the fruit central temperature of the other fruit-housing part 31, rising the relative humidity of saturated steam passing through the fruit-housing part housing the fruit the elevation of the fruit central temperature of which is delayed to improve heat conductivity, or increasing the amount of sent saturated steam passing through the fruit-housing part 31 to increase the heating amount of the fruits to improve the heat conductivity to improve the delayed elevation of the fruit central temperature. COPYRIGHT: (C)2005,JPO&NCIPI
