Method of manufacturing laminated assembly

A method of manufacturing a laminated assembly including a plate-shaped object having one surface and another surface positioned opposite the one surface, the method comprising:

• a depositing step of depositing an oxide film on at least one of the one surface of the plate-shaped object or a temporary joint surface of a temporary support substrate in an atmosphere whose temperature is kept in a first temperature range;
• after the depositing step, a hydrophilizing step of performing a hydrophilizing process on an exposed surface of the oxide film;
• after the hydrophilizing step, a temporarily joining step of temporarily joining the plate-shaped object and the temporary support substrate with the oxide film interposed therebetween by placing the one surface of the plate-shaped object and the temporary joint surface of the temporary support substrate in facing relation to each other with the oxide film interposed therebetween and bringing the confronting surfaces of the plate-shaped object and the temporary support substrate closely to each other;
• a joint member forming step of forming a joint member on at least one of the other surface of the plate-shaped object or a joint surface of a support substrate;
• after the temporarily joining step and the joint member forming step, a joining step of joining the plate-shaped object and the support substrate to each other with the joint member interposed therebetween by placing the other surface of the plate-shaped object and the joint surface of the support substrate in facing relation to each other with the joint member interposed therebetween and bringing the confronting surfaces of the plate-shaped object and the support substrate closely to each other;
• after the joining step, a vaporizing step of vaporizing water contained in the oxide film in an atmosphere whose temperature is kept in a second temperature range higher than the first temperature range;
• and
• after the vaporizing step, a separating step of separating the plate-shaped object and the temporary support substrate from each other.