The present invention relates to a movable joint, which is used in sheet with movable joints in the electronic devices such as mobile phone. Even if the movable joint is miniaturized, the required pressure and perfect contact feeling can still be available. And thus, the structure of the movable joint is: when in overlook, the part of the round periphery surrounded by the conical circumference ofthe oblique surface forms the spherical part of plumping upwards, the two ends are cut by two parallel lines symmetrically to the central line of the round, the intersection point of the linear edge and the round edge formed by cutting undergoes the arc angle reversing to shape an arc angle, forming an approximate ellipse.