To easily notice valuables such as a cellular phone, a wrist watch and a key of an automobile when throwing washing, to prevent the valuables from being accidentally thrown into a washing machine when washing in the washing machine.

A warning sensor or the like is fitted to the vicinity 2 of a washing throw-in port of the washing machine body 1, or an IC tag or the like is fitted to daily valuables such as a cellular phone, a wrist watch and a key of an automobile, and in throwing the washing into the washing machine, the valuable can be prevented from being thrown into the washing machine by a sensing warning sound or a warning lamp.