To make the circumference of an ashtray 17 clean and to facilitate its cleaning operation.

The ashtray 17 is push into a holder 18 when the ashtray 17 is not used. At this time, since a top opening of an ash receiving part 19 is covered with a top wall 38 of the holder 18 from above, ash is prevented from scattering on a circumference and the circumference is made clean. The cleaning of the ashtray 17 is carried out only by drawing out the ashtray 17 from the holder 18 and rocking the ashtray downward to facilitate a cleaning operation.