PURPOSE: To provide a titled printing hammer unit with an excellent durability which can prevent the rotation of a printing hammer with no increase in the cost by guiding the hammer and an arm member fixed thereon respectively with a bearing guide and a guide shaft.

CONSTITUTION: A printing hammer 17 is guided in one direction or in the opposite direction thereto with front and rear bearing guides 12 and 13. An arm member 18 fixed on the printing hammer 17 is guided in one direction or in the opposite direction thereto with a guide shaft 1. This can prevent the rotation of the printing hammer 17 while eliminating the need for complicating the shapes of the printing hammer and the bearing guides and higher accuracy.