Production method of mold, manufacturing method of pattern sheet, production method of electroform, production method of mold using electroform, and original

A production method of a mold comprising:

• a preparation process of preparing an original having an inclined portion which is formed in an enclosed shape on an outer peripheral portion of a protruding pattern formed at a center portion on a base and gradually increases in thickness from inside toward outside, and a thermoplastic resin sheet;
• and
• a forming process of forming a recessed pattern having an inverted shape of the protruding pattern on the thermoplastic resin sheet by pressing the original which is heated against the thermoplastic resin sheet at a position where the inclined portion of the original and a surface of the thermoplastic resin sheet are in close contact with each other, cooling the original in the state in which the original is pressed, and separating the original from the thermoplastic resin sheet,
• wherein a maximum thickness of the inclined portion is set so that a total volume of a portion of the protruding pattern which enters into the thermoplastic resin sheet when pressing the original against the thermoplastic resin sheet is equal to a total volume of spaces enclosed by the base, a surface of the thermoplastic resin sheet facing the original, and the inclined portion.