PROBLEM TO BE SOLVED: To provide an apparatus that ensures sterilization of a COincubator, has no leakage of fed ozone gas to the outside, uniformly circulates ozone in a storage and constantly and continuously controls an ozone concentration.SOLUTION: The apparatus for ozone sterilization of a COincubator includes: a sterilization tent 1 with an airtight hole 8a for airtightly protruding a leading end part of a tube connection part 14a provided in the COincubator 11 to the outside and a discharge part 9a for discharging ozone gas to the outside, for covering the COincubator 11 airtightly an ozone gas generator 18 for applying circulating sterilization to the inside and the outside of the COincubator 11 covered by the sterilization tent 1 by pressure-feeding the ozone gas to the tube connection part 14a and an ozone gas neutralization unit 26 for neutralizing and eliminating the ozone gas discharged from the discharge part 9a.
