Manufacturing method of the alkylene oxide polymer

The high degree of polymerization of alkylene oxide polymers, to provide a manufacturing method of an alkylene oxide polymer which can be produced with good industrial reproducibility. The alkylene oxide in the presence of zinc catalyst, a process for producing an alkylene oxide polymer by polymerization in an inert hydrocarbon solvent, Those said zinc catalyst, an organic zinc compound, obtained said 12 times aliphatic equivalents mono- alcohol and 0.2 to 1.1 equivalents of the organic zinc compound and a polyhydric alcohol is reacted Yes, The amount of monohydric alcohol in the polymerization reaction system, perform the polymerization reaction under conditions equal to or less than 0.01 equivalents with respect to the organic zinc compound, method for producing alkylene oxide polymer.