PROBLEM TO BE SOLVED: To provide an optical member capable of suppressing damage caused by autoclave processing and a cleaning operation, and a manufacturing method of an optical member.SOLUTION: A manufacturing method of an optical member includes: a deposition step of depositing an oxide coating film comprising a single predetermined element or a component mixed with the predetermined element to an outer peripheral surface of an optical member in the thickness of 20 nm or more and 1000 nm or less and a hydrothermal treatment step for applying a hydrothermal treatment to the optical member on which the oxide coating film is deposited under high-temperature and high-pressure of 250°C or more and 4.5 atm or more.COPYRIGHT: (C)2013,JPO&INPIT【課題】オートクレーブ処理及び洗浄作業による損傷を抑制することができる光学部材及び光学部材の製造方法を提供する。【解決手段】光学部材の外周表面に対して、所定元素の単体又は前記所定元素を複合させた成分からなる酸化物コーティング膜を20nm以上1000nm以下の厚さに成膜する成膜工程と、前記酸化物コーティング膜が成膜された前記光学部材に対して、250℃以上かつ4.5気圧以上の高温高圧下において水熱処理を施す水熱処理工程と、を備える。【選択図】図1
