To obtain a helmet capable of answering, even in noisy place, potable telephone or the like when called on potable telephone or the like in running by a motorcycle wearing the helmet or in working at a construction site and capable of safely answering potable telephone or the like even in running by the motorcycle.

This helmet has speakers 3, a mike 2 and a earphone mike set jack 7 and the both ends of a earphone mike wire 5 are connected to a helmet 4 side and a potable telephone 10 or the like.