A method for manufacturing a structural body in which while an in-process structural body is supported by a support member on a model forming table, a model forming layer which forms the structural body is laminated to form the structural body, the method comprising the steps of: supplying a liquid model forming material which forms the model forming layer on an existing surface formed of at least one of the model forming layer, the support member, and the model forming table to form a model forming layer from the model forming material; while a defining surface of a defining member which defines the upper surface of the model forming layer opposite to the existing surface is in contact with the upper surface of the model forming layer, injecting a support material for forming the support member to fill a space defined around the periphery of the model forming layer by the existing surface, a side surface of the model forming layer and the defining surface, and forming a support member by solidifying the support material to form a layer composed of the support member and the model forming layer; removing the defining member from the layer composed of the support member and the model forming layer; and after the step of removing the defining member, a step of providing a layer composed of a model forming layer and a support member, both of which are subsequently laminated, on the surface of the layer composed of the model forming layer and the support member which is exposed by the removal of the defining member, wherein the model forming material is cured by UV light irradiation, and in the step of forming a model forming layer, the model forming layer is formed by irradiating the model forming material with UV light while the defining surface and the surface of the model forming layer opposite to the existing surface are in contact with each other. supplying a liquid model forming material which forms the model forming layer on an existing surface formed of at least one of the model forming layer, the support member, and the model forming table to form a model forming layer from the model forming material; while a defining surface of a defining member which defines the upper surface of the model forming layer opposite to the existing surface is in contact with the upper surface of the model forming layer, injecting a support material for forming the support member to fill a space defined around the periphery of the model forming layer by the existing surface, a side surface of the model forming layer and the defining surface, and forming a support member by solidifying the support material to form a layer composed of the support member and the model forming layer; removing the defining member from the layer composed of the support member and the model forming layer; and after the step of removing the defining member, a step of providing a layer composed of a model forming layer and a support member, both of which are subsequently laminated, on the surface of the layer composed of the model forming layer and the support member which is exposed by the removal of the defining member, wherein the model forming material is cured by UV light irradiation, and in the step of forming a model forming layer, the model forming layer is formed by irradiating the model forming material with UV light while the defining surface and the surface of the model forming layer opposite to the existing surface are in contact with each other.