PROBLEM TO BE SOLVED: To provide a sterilization and deodorization device, capable of measuring the ozone concentration in a treatment chamber with an ozon concentration meter, even in the case that the temperature outside the treatment chamber is deviated from the usage environmental temperature range of the ozone concentration meter.SOLUTION: A sterilization and deodorization device 1 for sterilizing or deodorizing a processing object in a treatment chamber 2 with ozone gas includes an ozone concentration meter 3 for measuring the ozone concentration in the treatment chamber 2. The usage environmental temperature of the ozone concentration meter 3 is adjusted to within the usage environmental temperature range of the ozone concentration meter.