PURPOSE: To obtain a jacket having antistatic performance, with ease of classification and beautifully colored external appearance by constituting a plastic sheet forming the jacket as two-layer constitution formed by prescribed sheets.
CONSTITUTION: The plastic sheet 1 forming the jacket is formed as two-layer structure of an outer layer 1a and an inner layer 1b. A liner 3 formed by unwoven cloth is provided in the inside of the inner layer 1b of the sheet 1 and a flexible disc 2 is stored in the jacket 1. The outer layer 1a is colored and has heat seal performance and thermal resistance, the inner layer 1b has the heat seal performance and the antistatic performance, and a conductive resin is provided on the entire rear face of the plastic sheet 1. Thus, the jacket having the antistatic performance, with ease of classification and beautifully colored external appearance is obtained.