Provided is an anode mixture for all-solid-state lithium ion secondary batteries, which comprises an anode active material comprising Si and which can suppress an increase in internal resistance of all-solid-state lithium ion secondary batteries. Also provided is a method for producing the anode mixture. An anode mixture for all-solid-state lithium ion secondary batteries, comprising an anode active material. (A), a solid electrolyte (B), an electroconductive material (C) and a binder (D), wherein the anode active material (A) comprises Si; wherein the solid electrolyte (B) comprises a sulfidesolid electrolyte; wherein the electroconductive material (C) comprises a fibrous carbon material having six-membered carbon rings; and wherein the binder (D) comprises a polymer compound having aromatic rings.