Abstract: This invention relates to a soilless culture device comprising a culture solution tank and a cultivation vessel having a flow path for the solution fed from the solution tank. Where the solution flow path, or cultivation vessel is substantially long, the flow path is arranged to turn at an intermediate point so that it is divided into two portions, forward and return, disposed in parallel relation and allowed to communicate with each other at any desired point by means of a short-circuiting path. Equalization of the culture solution between the supply side and the discharge side can be thus attained. A level regulating pipe adapted to regulate the solution level in the cultivation vessel is provided between the solution tank and the cultivation vessel. A cup for adjusting the solution level is removably mounted in the opening of the level regulating pipe.