1 c and a notch provided on an outer section on a line extended in the longitudinal direction on the frame 1 it is noted that these holes are formed by pressing during secondary processing when a bolt or a screw is inserted into the speaker mounting hole 1 c and fixed in a complimentary member even when a stress exists with respect to the mounting surface the frame 1 deforms and bends along the line connecting the strain absorption notch 1 e and a strain adsorption hole 1 d and thus the strain does not extend to the central section of the frame the frame of the present invention affords the same function as that discussed above with a paper manufacturing or molding process fig5 shows an example of the process in fig5 a frame 1 is sandwiched between a male paper forming mold 20 and a female paper forming mold 21 a slight indentation 28 is provided on a section of the female paper forming mold 21 if the mold is adapted not to abut with the frame 1 that section which does not abut will not be heat pressed during the drying process and thus will remain at a low pressing pressure since the internal structure of the pulp is a coarse flexible structure if not pressured it is possible to create.