A last includes a base part including a bottom and a plurality of additional parts, each of which is formed in a plate shape and is capable of being assembled to the base part. The base part includes a mounting unit and a first forming surface. The plurality of additional parts include a second forming surface. Each additional part has an end face. The second forming surface includes the end face of each of the plurality of additional parts. The base part includes a first base member including a mounting unit and a second base member attachable to and detachable from the first base member.