PROBLEM TO BE SOLVED: To provide production methods of fermented feed which can suppress the mold development in the surface of feedstuffs and in which fermentation quality is improved and stabilized.SOLUTION: The present invention provides a production method of fermented feed comprising containing a feedstuff 15 in a container and fermenting it, wherein an exposed surface 16 of the feedstuff is positioned inside an opening position 13, which faces the exposed surface, or inner wall of the container. An aspect in which the volume of a feedstuff is 30-99 volume % with respect to the container amount, an aspect in which a distance d from the opening position or the inner wall of the container to the exposed surface of the feedstuff is 1 cm or more, and the like are preferable.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】飼料原料表面におけるかびの発生を抑制することができ、発酵品質が向上及び安定化した発酵飼料の製造方法の提供。【解決手段】容器に飼料原料15を収容して発酵させる発酵飼料の製造方法であって、飼料原料の露出表面16が、露出表面に対向する、容器の開口位置13又は内壁よりも容器の内側に位置する発酵飼料の製造方法である。飼料原料の体積が、容器の容量に対して30体積%~99体積%である態様、容器の開口位置又は内壁と飼料原料の露出表面との距離dが、1cm以上である態様などが好ましい。【選択図】図1