Abstract: There is disclosed to provide a recyclable formwork that can add the new function without spoiling the other functions of the recyclable formwork. The recyclable formwork includes: a main unit including a contact surface contacting with cast concrete, a non-contact surface being parallel and opposite to the contact surface, and a plurality of ribs outstanding from the non-contact surface to a side opposite to the non-contact surface and reinforcing the main unit; a case being housed between the plurality of ribs and being fixed on a side of the non-contact surface; and a circuit being stored in the case. A first highest point of the case at the side of the non-contact surface is not higher than a second highest point of upper ends of the plurality of the ribs.