Insulating tape of the present invention includes a mica layer containing mica is laminated on said mica layer, a reinforcement layer comprising a filler and fiber reinforcement, and a cellulose derivative layer laminated on the reinforcing layer, the cellulose derivatives layer, one or more glucose units _{hydroxyl, -CH 2 CH 2 OH, -} (CH 2 CH 2 O) p H ( wherein, p is an arbitrary number of repetitions of 0 super 50 below) include cellulose derivatives substituted with a functional group such as a range weight per unit area of 100 g / m ² or more 200 g / m ² or less of the mica, and the weight per unit area maximum particle size of the filler is at 100μm or less 10g characterized in that it is a / m ² or more 50 g / m ² or less. According to the present invention, can be a filler obtained by previously carried on the insulating tape to form the rather high thermal conductivity stator coil insulating layer flowing out when manufacturing the stator coil, and an insulating tape it is possible to provide an insulating tape that can improve the adhesion strength between.