A hydrogen peroxide vapor vaporizer, which is used in a sterilizer that sterilizes by using hydrogen peroxide vapor generated by vaporizing a hydrogen peroxide solution, comprises: a body part formed in the shape of a hollow column; a vaporization part which is provided at one side of the inside of the body part and has a predetermined capacity to accommodate a predetermined hydrogen peroxide solution; support parts for supporting the vaporization part to provide same to be spaced a predetermined distance apart from the inside of the body part; a heating part which is provided at one side of the vaporization part to heat the vaporization part; and a discharge part which is provided at the upper portion of the body part to induce discharging of the hydrogen peroxide vapor vaporized in the vaporization part.