It is an object of the present invention to provide a sealant for a One prop Fill process which hardly causes a peeling phenomenon between the sealant and a substrate in production of liquid crystal display device since the sealant has excellent adhesion to the substrate, and which is most suitable for producing a liquid crystal display device having low color irregularity in liquid crystal display since the sealant does not cause liquid crystal contamination, and relates to a sealant for a One prop Fill process, in which in production of liquid crystal display device by a One prop Fill process, even a portion where light may be not directly irradiated can be adequately cured, a liquid crystal is not deteriorated by ultraviolet light to be irradiated in curing the sealant, and high display quality and high reliability of the liquid crystal display device can be realized, a vertically conducting material, and a liquid crystal display device obtained by using these.The present invention is directed to a sealant for a One prop Fill process, which contains a (meth)acrylate compound having a structure represented by the following general formula (1), 10 to 70% by weight of a curable resin component contained in the sealant being the (meth)acrylate compound. In the general formula (1), R1 represents a hydrogen atom or a methyl group, X represents one species selected from the group expressed by the following chemical formula (2), Y represents one species selected from the group expressed by the following chemical formula (3), A represents a ring opening structure of cyclic lactone, and n has a value of zero or one.