Strike processing device for improving fatigue property of welded bond, fatigue property improvement method, and fatigue property improved manufacturing method of welded bond

Without utilizing complex mechanism, this invention, capable of realizing a self-orientation of a processing position, is a strike processing devicefor improving fatigue property of welded bond , improved strike processing method on fatigue property of welded bond , and improved strike processing method on fatigue property of welded bond which allows strike rod to press against a welded-end part while apply displacement towards the direction of a weld line and perform strike process. This processing device comprises: a strike processing mechanism part which executes strike processing; a support push-press mechanism part which supports the aforementioned strike processing mechanism part and press against the strike rod towards the welded-end part; and a displacement mechanism part which carries the aforementioned support push-press mechanism part and perform relative displacement toward the direction of the welded-end part of the weld line of the welded bond which is placed on the platform, moreover, an angula