To provide a functional maintenance method of a bridge bearing in the case of an earthquake capable of preventing the damage of the whole bearing by breaking a part of a fuse function which is easily replaced to maintain its function and preventing the upper structure and the lower structure from being damaged when an unexpected earthquake occurs.

In the method for maintaining its function by preventing the bearing 1 placed between the upper structure 6 and the lower structure 14 from being damaged by the unexpected earthquake motion in a bridge, when the unexpected earthquake occurs, a slip is apt to occur between a base plate 12 of the bearing 1 and the lower structure 14 by breaking a fixed member 13 for fixing the base plate 12 of the bearing 1 to the lower structure. Concretely, the fixed member 13 is formed of a bolt, and the bolt 13 is made to break along a joint surface between the base plate 12 and the lower structure 14.