A breathing protector for a tracheostoma is provided. The breathing protector comprises an inlet and an outlet, such that an air flow in use will pass from the surroundings of the user through said inlet to said outlet, into trachea of said user. Further, it comprises a filter housing, said filter housing comprising an inner housing part, an outer housing part, and a filter body. The inner housing part, comprising the outlet, a tracheal tube fitting and a support structure extends longitudinally and distally from the tracheal tube fitting. A base plate is arranged in a proximal zone of the tracheal tube fitting, said base plate extending radially outwards from the tracheal tube fitting. The outer housing par, comprising the inlet, forms a cage enclosing the support structure. The filter body is arranged between the support structure and the outer housing part. An assembly tool and an assembly method thereof are also provided.