PURPOSE: To finely finish the surface of a formative wall, and to heighten mold releasing ability for improving executing ability, and moreover to prevent a mold crack for reducing the cost of the formative wall by sticking a resin sheet having a shape responding to the formed face of a template body to its formed face.

CONSTITUTION: A polyolefin system resin sheet 3 having a shape responding to the formed face 2 of a template body 1 is stuck to the formed face 2 of the template body 1 formed of a polyolefin system foam resin plate to form a template B, which is set on the inside of one or both of opposite provided concrete panels A, C, and mortar M is poured into a space between them. When after the hardening of the mortar M, the concrete panels A, C and the template B are removed, a formative wall is therefore formed in response to the formed face 2 of the template B. Since in this case, the formed face 2 is covered by a resin sheet 3, the honeycomb pattern peculiar to beads type foam resin is not formed, a fine wall face is obtained.