To provide a convenient nozzle assembly for a cleaner so as to readily carry out cleaning even in a heavily soiled part by using a disposable nozzle part.

In use of this nozzle assembly 1 for the cleaner, it is mounted to the tip of a flexible hose or an extension pipe P of the cleaner. The nozzle assembly 1 is constructed of a connection pipe 2, which can be fitted in the tip part of the flexible hose or the extension pipe P, and a cylindrical paper nozzle 3 mounted to the tip of the connection pipe 2 freely removably. As the paper nozzle 3, a roll core of a toilet paper roll on the market can be used.