Forming system

A forming system comprising:

• a forming device configured to expand and deform a metal material to perform forming;
• at least one transport device configured to transport the metal material;
• a pretreatment device configured to perform pretreatment for the forming;
• and
• a positioning portion that positions the metal material in a part of the pretreatment device,
• wherein the transport device transports the metal material to the forming device and the pretreatment device in a held state,
• during a period from a transport process in which the metal material is transported to any of devices by the transport device to a treatment process performed by any of the devices, at least one of the transport device and any of the devices continues holding the metal material,
• the transport device holds the metal material in a state of being positioned in the positioning portion,
• the metal material continues being held by any of the transport device, the forming device, and the pretreatment device, from when the metal material is held by the transport device in the positioning portion to when the forming is performed by the forming device, and
• the positioning portion includes a first support portion and a second support portion that support both end portions of the metal material, and a third support portion that supports a central position of the metal material in a longitudinal direction.