To provide a nonburnable waste-disposing method and a device for reducing the disposal cost and reducing the volume of nonburnable wastes.

A waste storage chamber 4 for storing nonburnable waste including garbage is formed on a rear deck 3 of a car 2 with rear deck, and in the waste storage chamber 4, a culture solution storage tank 8 in which a culture solution of organic compound-decomposing microbes are filled, a feed means 9 for feeding the culture solution in the tank into the waste storage chamber and an agitation 5 for agitation the waste in the waste storage chamber 4 and spreading the culture solution all over the garbage in the nonburnable waste are provided.