Method for producing object

A method for producing an object that includes forming and laying N unit layers into which an object is divided, sequentially from a first layer to an Nth layer, using a resin material as a material, or using a resin material for implementing a step, to form the object, the method comprising:

• performing a discharge treatment at either or both of a timing while forming a unit layer among the N unit layers, and a timing after forming the unit layer, but before starting forming a next unit layer among the N unit layers,
• wherein the discharge treatment includes:
• emitting a plasma from a plasma irradiation mechanism of an apparatus and then irradiating at least a part of the N unit layers with the plasma, the plasma being generated by applying a voltage to a gas in a discharge portion from a plasma irradiation port;
• supplying the gas into an inside of a gas supply chamber of the apparatus, the gas supply chamber being in a longitudinal shape extending in an extending direction, the discharge portion being provided at the inside of the gas supply chamber;
• and
• exhausting and discharging the gas from an exhaust member of the apparatus, the exhaust member being located on an outer surface of the gas supply chamber and extending along the outer surface of the gas supply chamber in the extending direction.