PROBLEM TO BE SOLVED: To provide a chlorine dioxide gas generator pack, that is appropriate for being taken along, for areas where sterilization, disinfection, and deodorant are necessary, and to provide a manufacturing method and a preservation method thereof.SOLUTION: The chlorine dioxide gas generator pack 1 includes: a chlorine dioxide gas generator 10 containing a mixture of chlorite powder, powder of a gas generation modifier, powder of a moisture absorbent, water-absorbing resin powder, and powder of an activator and a gas-permeable membrane container 20 for storing the chlorine dioxide gas generator 10, which allows penetration of water vapor and a chlorine dioxide gas therethrough.