<；P>；PROBLEM TO BE SOLVED: To provide a sterilizer, efficiently and reliably sterilizing a medical instrument packed in the state of storing medicaments in a package. <；P>；SOLUTION: This sterilizer includes: a sterilizing chamber 3 for storing material to be treated； and a mesh-like sterilizing basket 4 disposed in the sterilizing chamber 3, wherein ultraviolet lamps 31 are disposed parallel to the top, base and side of the sterilizing basket 4, respectively, and a plurality of decomposition lamps 32 are disposed parallel to the ultraviolet lamps 31. The sterilizer further includes: a vacuum pump 56 for discharging the air in the sterilizing chamber 3 storing the material to be treated to reach predetermined atmospheric pressure in the sterilizing chamber 3； an oxygen cylinder 36 for supplying gas containing oxygen into the sterilizing chamber 3 from which the air is discharged by the vacuum pump 56； and a control part 60. <；P>；COPYRIGHT: (C)2011,JPO&INPIT
