PROBLEM TO BE SOLVED: To provide a mushroom-cultivation culture medium and a method for producing mushrooms, with which large mushrooms are produced easily and in high yield without performing such as thinning at an initial stage of the fruit bodies, ergothioneine concentration of mushrooms is increased, and cow manure generated in large quantity can be effectively utilized.SOLUTION: Provided are a mushroom-cultivation culture medium containing farmyard manure mixture obtained by mixing cow manure and horse manure at a predetermined ratio, and a method for producing mushrooms by using the medium.COPYRIGHT: (C)2016,JPO&INPIT