In {HEAD ~ the planet gear type speed reduction starter} of {TAIL ~ the invention}, the internal gear of resin is arranged inside the casing or a metal ring fitted in the casing with a predetermined gap between the internal gear and the casing or the metal ring in the radial direction, to absorb a shock in a predetermined range 
In { HEAD ~ the planet gear type speed reduction starter } of { TAIL ~ the invention } , the internal gear of resin is arranged inside the casing or a metal ring fitted in the casing with a predetermined gap between the internal gear and the casing or the metal ring in the radial direction , to absorb a shock in a predetermined range
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