To provide an envelope for a disk type storage medium capable of displaying index, as of the content of the disk type storage medium, while storing the medium compactly.

The envelope for disk type storage medium has an envelope body 1, and a flap 5 formed along the open edge 3e of the envelope body 1. In such an envelope, one or more index forming sections 6 are formed in the flap 5 along the opening edge 3e such that the edges, except the one edge of the flap 5, of the index forming sections are defined by corresponding cutting lines 6a. By cutting out each index forming section, except the one edge of the flap 5, along the cutting line 6, an index piece 61 is formed from the index forming section 6.

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