A last including an upper forming surface for forming an upper including a wearing opening, the last comprising: a base part that includes a bottom defining a bottom surface of the upper; 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, wherein the base part includes: a mounting unit that mounts the plurality of additional parts such that the plurality of additional parts are arranged in a multi-layered form along one direction; and a first forming surface that defines a first region of the upper forming surface, the plurality of additional parts include a second forming surface defining a second region different from the first region in the upper forming surface while being attached to the mounting unit, each additional part in the plurality of additional parts has an end face, the second forming surface includes the end face of each of the plurality of additional parts, and the base part includes: a first base member that includes the mounting unit; and a second base member attachable to and detachable from the first base member, characterized in that the second base member is moveable upward with respect to the first base member, such that the second base member and a plurality of additional parts attached thereto are removable from the wearing opening of the upper while the second base member is separated from the first base member, and the first base member is configured such that the first base member and the plurality of additional parts attached thereto are removable from the wearing opening subsequent to removal of the second base member. a base part that includes a bottom defining a bottom surface of the upper; 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, wherein the base part includes: a mounting unit that mounts the plurality of additional parts such that the plurality of additional parts are arranged in a multi-layered form along one direction; and a first forming surface that defines a first region of the upper forming surface, the plurality of additional parts include a second forming surface defining a second region different from the first region in the upper forming surface while being attached to the mounting unit, each additional part in the plurality of additional parts has an end face, the second forming surface includes the end face of each of the plurality of additional parts, and the base part includes: a first base member that includes the mounting unit; and a second base member attachable to and detachable from the first base member, characterized in that the second base member is moveable upward with respect to the first base member, such that the second base member and a plurality of additional parts attached thereto are removable from the wearing opening of the upper while the second base member is separated from the first base member, and the first base member is configured such that the first base member and the plurality of additional parts attached thereto are removable from the wearing opening subsequent to removal of the second base member. a mounting unit that mounts the plurality of additional parts such that the plurality of additional parts are arranged in a multi-layered form along one direction; and a first forming surface that defines a first region of the upper forming surface, the plurality of additional parts include a second forming surface defining a second region different from the first region in the upper forming surface while being attached to the mounting unit, each additional part in the plurality of additional parts has an end face, the second forming surface includes the end face of each of the plurality of additional parts, and the base part includes: a first base member that includes the mounting unit; and a second base member attachable to and detachable from the first base member, characterized in that the second base member is moveable upward with respect to the first base member, such that the second base member and a plurality of additional parts attached thereto are removable from the wearing opening of the upper while the second base member is separated from the first base member, and the first base member is configured such that the first base member and the plurality of additional parts attached thereto are removable from the wearing opening subsequent to removal of the second base member. a first base member that includes the mounting unit; and a second base member attachable to and detachable from the first base member, characterized in that the second base member is moveable upward with respect to the first base member, such that the second base member and a plurality of additional parts attached thereto are removable from the wearing opening of the upper while the second base member is separated from the first base member, and the first base member is configured such that the first base member and the plurality of additional parts attached thereto are removable from the wearing opening subsequent to removal of the second base member.