PURPOSE: To manufacture the cassette device for the printer, through which the production of noises of a backlash with the operation of the printer is removed, by positively fast sticking and holding a cassette to a cassette holder apart from the function of a type wheel.

CONSTITUTION: The cassette B incorporating the type wheel A is inserted into the cassette holder (C). A through-hole 5 into which a click section 3 can be penetrated slightly is bored to a cassette guide 1, and a recessed connecting section 6 is set up fixedly where fitting to said click section 3 when the cassette B is inserted up to a predetermined position to the cassette holder C in the region of the cassette B. Accordingly, an incorporated set in which the cassette B is fast stuck to the cassette holder C through the connection of a fitting section 4 and the connecting section 6 only by inserting the cassette B to the cassette holder C is obtained.