An ultraviolet curing resin property measuring apparatus for determining the viscosity or viscoelasticity of a specimen on the basis of a detected torque, comprising: a rotating plate (17,17A) supported rotatably about a center axis; a torque detection plate (18,18A) disposed on the same axis parallel to the rotating plate (17,17A), with a given gap left between the two plates; a torque detection means for detecting a torque exerted on the torque detection plate (18,18A) through the specimen of an ultraviolet curing resin held between the rotating plate (17,17A) and the torque detection plate (18,18A) when the rotating plate (17,17A) is turned; a total reflection prism, formed of either the rotating plate (17,17A) or the torque detection plate (18,18A), which is made from a material that has a greater refractive index than the ultraviolet curing resin and transmits ultraviolet light and infrared light; an ultraviolet irradiation means disposed on the other side of the total reflection prism from the specimen, for directing an ultraviolet beam onto the specimen through the total reflection prism; an infrared irradiation means for directing an infrared beam into the total reflection prism; an infrared detection means for detecting the infrared beam emerging from the total reflection prism after total reflection from the interface between the prism and the specimen; and a spectrum analysis means for analyzing the infrared absorption spectrum of the specimen on the basis of the infrared beam detected by the infrared detection means, wherein the ultraviolet curing resin property measuring apparatus is configured so that, while the viscosity or viscoelasticity of the ultraviolet curing resin in the curing process is measured on the basis of the detected torque, the spectrum analysis means simultaneously measures the infrared absorption spectrum of the ultraviolet curing resin. a rotating plate (17,17A) supported rotatably about a center axis; a torque detection plate (18,18A) disposed on the same axis parallel to the rotating plate (17,17A), with a given gap left between the two plates; a torque detection means for detecting a torque exerted on the torque detection plate (18,18A) through the specimen of an ultraviolet curing resin held between the rotating plate (17,17A) and the torque detection plate (18,18A) when the rotating plate (17,17A) is turned; a total reflection prism, formed of either the rotating plate (17,17A) or the torque detection plate (18,18A), which is made from a material that has a greater refractive index than the ultraviolet curing resin and transmits ultraviolet light and infrared light; an ultraviolet irradiation means disposed on the other side of the total reflection prism from the specimen, for directing an ultraviolet beam onto the specimen through the total reflection prism; an infrared irradiation means for directing an infrared beam into the total reflection prism; an infrared detection means for detecting the infrared beam emerging from the total reflection prism after total reflection from the interface between the prism and the specimen; and a spectrum analysis means for analyzing the infrared absorption spectrum of the specimen on the basis of the infrared beam detected by the infrared detection means, wherein the ultraviolet curing resin property measuring apparatus is configured so that, while the viscosity or viscoelasticity of the ultraviolet curing resin in the curing process is measured on the basis of the detected torque, the spectrum analysis means simultaneously measures the infrared absorption spectrum of the ultraviolet curing resin.