| 摘要 |
There is disclosed an index device in which a cover member is axially attached to a receptacle so as to be openable and closable, and a multiplicity of cards are accommodated therebetween so as to be superposed on each other. This indexing device is arranged such that: a rotation resisting member including viscous substance for moderating the resilient repulsion forces when the cover member is unfolded from the receptacle is provided between the receptacle and the cover member; the rotation resisting member has a rotor which rotates within hermetically sealed casings attached to the receptacle and filled with the viscous substance; and notches are formed in a peripheral portion of the rotor.
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