Cushion of folding portable electronic device and waterproof structure of folding portable electronic device

A waterproof structure of a folding portable electronic device comprising one case and an other case and being settable to a closed state where one surface of the one case is covered with the other case and an opened state where the one surface is opened,

• the waterproof structure comprising:
• a cushion including:
• a projecting part which is disposed in the one case and projects from the one surface to come in contact with the other case in the closed state;
• and a body part having a side surface sandwiched between an outer surface of a frame constituent member which constitutes a frame of the one surface and an inner surface of a back surface constituent member to cover a back surface which is the surface on a side opposite to the one surface of the one case, whereby the body part closely comes in contact therewith;
• wherein on the outer surface of the frame constituent member of the one case, there are disposed fitting portions having a convex shape and provided with the upper surfaces which abut on bottom surfaces of claw portions having a convex shape and disposed on the inner surface of the back surface constituent member, and
• the cushion includes through holes which the fitting portions of the frame constituent member pass, so that the upper surfaces of the fitting portions abut on the bottom surface of the back surface constituent member.