In 1868 Takanaka was appointed Councilor (which is called 'sanyo' in Japanese) and Assistant Judicial Officer (which is called 'gonhanji' in Japanese) of the Department of Home Affairs (which is called the 'naikoku jimu kyoku), and became a Minor Controller (which is called 'shoben' in Japanese based on the ritsuryo system) in 1869.
明治元年（1868年）に参与・内国事務局権判事に任命され、同2年少弁となる。