A method for producing an yttrium oxide-containing thin film by atomic layer deposition, the method comprising: a step for introducing a raw material gas containing tris(sec-butylcyclopentadienyl) yttrium into a treatment atmosphere in order to deposit tris(sec-butylcyclopentadienyl) yttrium on a substrate; and a step for introducing a reactive gas containing water vapor into the treatment atmosphere and causing the reactive gas to react with the tris(sec-butylcyclopentadienyl) yttrium that has been deposited on the substrate, thereby oxidizing yttrium is provided.