Kikai Ningyou desu ne

 is a musical composition from the Nichijou soundtrack. It was used once, in Episode 18, Part 76, when Biscuit #2 introduces himself and his functions.

Google Translate translates the title as "It is a reasonable day," which sounds like something that male narrator would say at the end of a scene at the Shinonome home, like the one it is used in, which is clever if roughly accurate.