To provide a sealing structure for a portable electronic equipment capable of maintaining sealing superb performance between relatively moving two members by an O-ring, and also exhibiting stable low-sliding resistance.

In the sealing structure for a portable electronic equipment consisting of a rubber-like elastic material arranged between relative movement members of the portable equipment, the surface of the O-ring is treated with a reactive surface treatment agent, and the O-ring is used at a compression rate of 3 to 15%.