To provide a method for protecting an electric wire in an electric connection box for protecting electric wire W hung to a lower part of an electric connection box body (equivalent to an upper cover) without using a lower cover, and thus, dissolving a problem which arises when the lower cover is used.

In a method for protecting an electric wire in an electric connection box in which an electric wire W connected to an electric connection box body 11 is pulled out downward from a lower part of the electric connection box body, after that, bent and guided toward the side, a mold body for packaging the electric wire is formed by filling a molding agent 3 in a form block 1, attaching the form block filled with the molding agent 3 to the lower part of the electric connection box body, and solidifying the molding agent 3 in the form block.