Electronic device and flexible printed circuit board

An electronic device comprising:

• a panel comprising a mounting edge extending along a first direction and a plurality of pad portions arranged along the mounting edge;
• a flexible printed circuit board mounted on the panel and overlapping the plurality of pad portions;
• and
• a driver IC chip mounted on the flexible printed circuit board and configured as a signal supply source which supplies a signal necessary to drive the panel, wherein
• the flexible printed circuit board comprising a base member comprising a first surface and a second surface on an opposite side to the first surface, wiring lines placed on a side of the first surface of the base member and a protective layer covering the wiring lines, and including a bent portion which can be bent,
• the base member comprising a groove portion located in the bend portion and formed in the second surface,
• the groove portion comprising a plurality of concavity portions extending along a second direction intersecting the first direction and arranged along the first direction, and
• a thickness of the base member in a site where the groove portion is formed being less than a thickness of the base member in a site overlapping the driver IC chip.