PROBLEM TO BE SOLVED: To provide an indoor-type self-propelled working machine capable of feeding water on plant by sprinkling of water and satisfactory to enhance the growth of the plant. SOLUTION: This working machine 4 is applicable to a building e.g. house having passageways 1 along which a lot of encases 2 for cultivation are provided, wherein the self-propelled working machine 4 with sprinkler pipes 3 designed to move above the cases 2 is so provided as to travel along a track, and wherein the machine 4 is integrally provided with a contacting member 6 adapted to contact with the foliage of seedlings 5 in the encases 2.
