A method for producing propylene oxide, the method comprising the following steps 1) to 5): 1) oxidation step: a step of obtaining a reaction mixture containing cumene hydroperoxide by contacting a mixture containing cumene and cymene with an oxygen-containing gas to cause a reaction between cumene in the mixture and oxygen in the gas; 2) epoxidation step: a step of obtaining a reaction mixture containing propylene oxide and cumyl alcohol by contacting the reaction mixture containing cumene hydroperoxide obtained in the oxidation step with propylene in the presence of a catalyst to cause a reaction between cumene hydroperoxide in the reaction mixture and propylene; 3) separation step: a step of obtaining a residual mixture containing cumyl alcohol by separating a mixture containing propylene oxide from the reaction mixture containing propylene oxide and cumyl alcohol obtained in the epoxidation step; 4) cumene conversion step: a step of obtaining a reaction mixture containing cumene by converting cumyl alcohol in the residual mixture containing cumyl alcohol obtained in the separation step into cumene; and 5) cumene recovery step: a step of obtaining a recovery mixture containing cumene and cymene with a cymene concentration, in a steady state, of 100 ppm by weight or more and 5000 ppm by weight or less (the cymene concentration is calculated based on the weight of the recovery mixture containing cumene and cymene obtained in the cumene recovery step) by distilling the reaction mixture containing cumene obtained in the cumene conversion step, wherein the distillation is performed under a condition for removing 0.025 wt% or more of cymene contained in the reaction mixture containing cumene obtained in the cumene conversion step (the weight ratio of cymene is calculated based on the weight of cymene contained in the reaction mixture containing cumene obtained in the cumene conversion step); wherein, at least a part of the mixture containing cumene and cymene in the oxidation step is the recovery mixture containing cumene and cymene obtained in the cumene recovery step. 1) oxidation step: a step of obtaining a reaction mixture containing cumene hydroperoxide by contacting a mixture containing cumene and cymene with an oxygen-containing gas to cause a reaction between cumene in the mixture and oxygen in the gas; 2) epoxidation step: a step of obtaining a reaction mixture containing propylene oxide and cumyl alcohol by contacting the reaction mixture containing cumene hydroperoxide obtained in the oxidation step with propylene in the presence of a catalyst to cause a reaction between cumene hydroperoxide in the reaction mixture and propylene; 3) separation step: a step of obtaining a residual mixture containing cumyl alcohol by separating a mixture containing propylene oxide from the reaction mixture containing propylene oxide and cumyl alcohol obtained in the epoxidation step; 4) cumene conversion step: a step of obtaining a reaction mixture containing cumene by converting cumyl alcohol in the residual mixture containing cumyl alcohol obtained in the separation step into cumene; and 5) cumene recovery step: a step of obtaining a recovery mixture containing cumene and cymene with a cymene concentration, in a steady state, of 100 ppm by weight or more and 5000 ppm by weight or less (the cymene concentration is calculated based on the weight of the recovery mixture containing cumene and cymene obtained in the cumene recovery step) by distilling the reaction mixture containing cumene obtained in the cumene conversion step, wherein the distillation is performed under a condition for removing 0.025 wt% or more of cymene contained in the reaction mixture containing cumene obtained in the cumene conversion step (the weight ratio of cymene is calculated based on the weight of cymene contained in the reaction mixture containing cumene obtained in the cumene conversion step); wherein, at least a part of the mixture containing cumene and cymene in the oxidation step is the recovery mixture containing cumene and cymene obtained in the cumene recovery step.