<；P>；PROBLEM TO BE SOLVED: To provide a plant cultivation greenhouse into which solar heat is effectively collected to secure temperature rise in the greenhouse so as to enable all-year-round cultivation of farm crops and the like without using a large amount of fossil fuel. <；P>；SOLUTION: The plant cultivation greenhouse, as a whole, has a semicylindrical shape having a semicircular cross section, and is structured as follows: the side wall surface in a longitudinal direction of the semicylindrical shape is made of double-layered transparent and/or translucent frame-forming film； a protection film capable of covering the ground surface at night is disposed at an intermediate part between the frame-forming film and the ground surface； a reflecting mirror reflecting solar light inward is set to the side wall surface part the most part of which is hidden behind the solar light in the daytime； a heat-absorbing accumulated plate is disposed along the lower part of the side wall at the inside of the greenhouse； and also a hot-water circulation hose through which hot water is circulated onto the heat-absorbing accumulated plate from a hot-water accumulation device. <；P>；COPYRIGHT: (C)2011,JPO&INPIT
