Flexible display apparatus

A flexible display apparatus comprising:

• a display part, a first adhesive film, an optical film, a second adhesive film, and a window film sequentially stacked,
• the second adhesive film having a water vapor transmission rate of about 200 g/m2·24 hr or less, and
• the first adhesive film having a lower restoration force than the second adhesive film as calculated by the following Equation B:
• Restoration force=(1−(X1)/(X2))×100,
• where X1 and X2 are values obtained as follows:
• where both ends of a polyethylene terephthalate (PET) film are defined as a first end and a second end, respectively, a specimen for calculation of restoration force is prepared by attaching a first PET film and a second PET film to each other via an adhesive film having a size having a length of 20 mm and a width of 20 mm, such that a first end of the first PET film and a second end of the second PET film are attached to each other in order of the first end of first PET film, the adhesive film, and the second end of second PET film, and a jig is secured to a second end of the first PET film and a first end of the second PET film, respectively, and with one of the jigs secured under a load of 10 MPa, the other jig is pulled at 25° C. and at 300 mm/min until the adhesive film has a length of X2 of 1,000% of an initial thickness thereof, and is maintained for about 10 seconds, followed by restoring the other jig at 300 mm/min to obtain a stretched length of X1 of the adhesive film upon application of 0 kPa to the adhesive film in a graph wherein the X-axis is the stretched length of the adhesive film and the Y-axis is force applied to the adhesive film.