In the production method of monocyclic aromatic hydrocarbons, oil feedstock having a 10 volume % distillation temperature of 140° C. or higher and a 90 volume % distillation temperature of 380° C. or lower is brought into contact with a catalyst for producing monocyclic aromatic hydrocarbons that includes a mixture containing a first catalyst which contains crystalline aluminosilicate containing gallium and/or zinc and phosphorus and a second catalyst which contains crystalline aluminosilicate containing phosphorus.